Winger Lamont was stretchered off with a facial injury after 20 minutes with the Scots leading 3-0, and will now miss Saturday's final Six Nations match against Italy.
Scotland went on to beat England 15-9, and more comfortably than the scorelin
e suggests.
The way Lamont went to ground to try to mop up danger rather than risk conceding a line-out a few yards from the home line was courage personified – as Edinburgh prop Jacobsen recognised.
He said: "The bravery shown by Rory when putting his body on the line shows what this team are willing to do for each other.
It was also his view that while Lamont was taken to hospital, his legacy was to give Scots strength to endure the first – and only – serious pressure of the match, and go on from there.
"Keeping England out when they attacked our line just after Rory had gone off was definitely the key period. We also took heart from what happened in Dublin when we threw everything at Ireland for a spell a fortnight earlier.
"From what happened to us, we knew if we stood up to them – which we did with 98 per cent of tackles completed, an impressive figure in anybody's book – then we could go up to the other end and score.
"Keeping sides out when they throw everything at you, as England did, provides confidence and that also came from knowing we were cutting down on the basic errors which had previously let us down."
After that it was about taking every chance that came Scotland's way and, not for the first time, goal-kicker Chris Paterson provided the lead.
With four penalties from as many attempts – the other home score was a long-range effort from Dan Parks – Paterson hoisted his Test tally to 649. He is now just 18 points short of Gavin Hastings' Scottish record of 667, and behind Saturday's statistics, lay a masterclass in precision given the squally conditions.
To put that effort into perspective, Jacobsen is able to go back to the days when he and Paterson came up through the youth ranks together.
So it was a telling remark when he said: "That performance by Chris has got to be up there with the very best I have seen from him in that wind and rain."
From his last miss at international level in the World Cup warm up clash with Ireland, Paterson has slotted 30 kicks in a row.
According to Jacobsen, it is not just his points that matter, but the psychological edge he provides. "The forwards are working hard to get in position and try to force penalties.
"Against England most of the time we went into their danger zone we were rewarded and the two successful kicks on either side of half-time were crucial."
Such is the general fillip that comes with a win over last year's World Cup finalists that there must be a chance Paterson can claim Hastings' record before the current RBS Six Nations campaign ends for Scotland in Rome on Saturday.
What is certain is that Jacobsen believes the team have come too far to take a backward step now.
"There's just no point putting in performances like that at home if we go away and let mistakes creep back in."
Rome's Stadio Flaminio holds special memories for the man nicknamed Chunk, as it was there that he made his first Six Nations start four years ago.
But suddenly hopes of signing off with a win have been transformed and it was uncanny how closely Saturday's match was predicted by the outstanding home player, Hugo Southwell.
His pre-match comments are worth re-visiting. He said: "England are a side who could give away penalties.
"It could ultimately be a case of the world's best goal-kicker (Paterson] against the world's most accomplished (Jonny Wilkinson, whose three penalties set a new global best mark of 1099]. Obviously, definitely I'd back Scotland's expert against England's expert."
Edinburgh full back Southwell's solidity in defence and ability to relieve any pressure with raking kicks were the most influential factors in what was Scotland's 42nd victory in 125 meetings with the auld enemy (17 draws) whose current world ranking position is six rungs higher on the ladder.
Also crucial was the security of captain Mike Blair under the high ball, which earned him man-of-the-match honours in some quarters, to go with his name being engraved for posterity on the Calcutta Cup.
Then there was the contribution of under-fire coach Frank Hadden, whose tactical nous in balancing his substitutes in favour of forwards to counter-act English weight advantage was a masterstroke.
Hadden had been criticised for the conservatism that kept flanker Ally Strokosch – and what price a Lions' tour next year for the ex-Boroughmuir player – too long on the sidelines.
But his judgement in knowing when to reinstate Simon Taylor, whose tidying and ball carrying were immense, to the starting line-out, and when to introduce Jason White from the bench, was inspired.
Scotland's morale for the journey down the home straight was boosted by ex-Watsonian White's impact, most notably a thumping tackle on Paul Sackey reminiscent of when Fin Calder took the fight to England with his surge early in the 1990 Grand Slam decider.
Any composure and confidence that England had seemed to be drained by the sheer commitment of the Scots in hounding and harrying their way to victory, which had started to look a possibility when Paterson kicked an eighth-minute penalty.
Though Wilkinson replied in the 25th minute, those three points were a poor return for intense pressure and, in any case, Paterson replied almost immediately before making it 9-3 just before the turnaround.
The second half started as the earlier period had ended with Paterson on target and, when Dan Parks took over from some way out to land a kick that takes him to 98 points for Scotland, it meant any further home score would leave England requiring the equivalent of more than two converted tries.
What England got was two penalties and, while they had the final say on the scoreboard, Scotland had the precious match points and Jacobsen was left in no doubt what success meant and how it was achieved.
"The boys dug deep, smashed everything and defended like demons.
"They tried to drive us over our line, they tried to take us on – we fronted up."
All that remained was a Scottish lap of honour with nobody prouder than Jacobsen, especially given that the 28-cap stalwart had spoken beforehand about how he'd never beaten England at any level, in a career that encompasses sundry age-group honours.
So how did the victory parade feel?
"Magic. We were due the fans and the coaches a performance," said Jacobsen, who was entitled to reflect afterwards on a mission well and truly accomplished.
The full article contains 1192 words and appears in Edinburgh Evening News newspaper.
