Former Indian skipper MS Dhoni was spotted taking the match ball from the umpires while heading towards the dressing room which has now led the viewers believe that the 37-year-old is set to announce his retirement from global cricket.
Root's Yorkshire colleagues David Willey and Adil Rashid took three wickets apiece as the tourists were restricted to 256 for eight.
Morgan added: "I think we were outstanding".
Meanwhile, England won the decider by 8 wickets to seal the series 2-1.
"We started poorly (but) as the series has gone on we have improved, it is a benefit of playing a bilateral series. Virat's a really passionate player and I'm sure he doesn't need any extra motivation to go out there and put everything into what he does". "You play against the same team over and over again, it can present different challenges - that constant improvement has been brilliant since Trent Bridge", Morgan said.
Stokes has yet to return to his best after his latest injury setbacks and was subdued for much of the one-day series against India but Root insists he is not distracted by the prospect of his day in court.
An elated Root celebrated by dropping his bat to the ground - the "mic drop" gesture more associated with rock stars and stand-up comedians than cricketers. 10 runs off the over.
But Stokes ran out Dhawan for a fluent 44 with direct hit after the left-handed opener was sent back by Kohli. Cummins said he was actually paying the Indian batsman a compliment and that his comments had been misinterpreted.In an on-stage interview at an event in June, Cummins had said, "My fearless, bold prediction; I'd say I think Virat Kohli is not going to get a hundred and we're going to knock them off over here", referring to the Indian team's tour of Australia which begins in November.
Having whitewashed a weakened Australia 5-0 last month, the manner of victory in Tuesday's winner-takes-all clash would have further encouraged England, who will look to win the World Cup for the first time next year as hosts.
Recently, the Indian cricket team is on their United Kingdom tour and playing the ODI series against England.