Arsenal are playing the role of hunters rather than hunted in this Premier League title race as they try to keep pace with Liverpool's relentless form at the top.
If there such a thing as a "must-win" game in early February, this was arguably it as Arsenal knew they could not afford to drop points.
Defeat would have left Arsenal nine points behind Liverpool having playing a game more. When they needed someone to step up, it was teenager Lewis-Skelly who settled any lingering nerves.
Having excelled with some powerful surges from defence in the first half, he allowed Arsenal to establish a two-goal cushion with his goal.
Erling Haaland demanded to know "who are you?" when he clashed with the youngster at the end of a fractious 2-2 draw at Etihad Stadium in September, when Lewis-Skelly was booked while warming up before coming on as a late substitute.
If Haaland did not know who Lewis-Skelly was then, the Norwegian marksman certainly knows now.
The manner and margin of Arsenal's win will surely fuel their self-belief as they try to chase down Liverpool.
And the second-half goal rush allowed Havertz to feel both relief and elation after a first-half miss, shooting wide with the goal at his mercy, that started to feel like a defining moment when Haaland levelled matters.
Instead, Emirates Stadium was a scene of raucous celebration at the final whistle as Arsenal's title bid received a real turbo charge.