Ledge

Evans was hustling around the net trying to wrap the puck in, so of course he puts his head down for a second to tuck it in. It's Scheifele who is there to charge in after skating the length of the ice and barely slowing down to take advantage of Evans' vulnerable position to deliver a massive hit where he brought up his elbow with clear intention to injure. He was frustrated throughout the third period, and cross checked a player who was on the ground before his anger consumed him once again and he decided to go for a huge hit instead of trying to defend the goal with his stick. In the words of Jesperi Kotkaniemi, 'I think it's disgusting'.

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to take advantage of Evans' vulnerable position 

a position the player put himself in, by not keeping his head up. 

By trying to score a goal? This is the NHL, and an empty net goal would seal the game in favour of the Habs. Is he supposed to look both ways before he tucks the puck in? He shouldn't have to! This sort of McSorley hockey doesn't belong in the NHL anymore. You can't deny that the right defensive play by Scheifele was to either lunge or dive and try to knock the puck away with his stick, not accept that Evans was going to score and basically retaliate with a punishing hit with intent to injure. Evans can't be at fault because Scheifele isn't using the rational part of his brain to make a decision and gives up an easy goal when he could have defended but instead took out his frustration on Evans. This is a suspendable action, no doubt.