For sure. This series might get ugly if retaliation occurs.
Tough. Idk I would call it clean. Scheifele was clearly trying to get there fast enough to stop the wrap around and he hit him really hard as a result. I have not taken the time to slow it down and see if he hit him in the head, though from my initial watching of it live, I did not think it was high. I think a charging penalty makes perfect sense though.
I don't think Scheifele throwing his stick out there in a poke check is a good way to defend what Evans was doing though. Not to mention that for him to even get that close to do that, he would have to have been moving so fast and he would have either hit the net, possibly injuring himself or going for what I think he saw as a clean hit to stop someone with the puck from scoring.
Scheifele has no history of anything like this, I bet he regrets the injury happening, but I think most players in that situation would have done the same thing. In fact, if they didn't, I would be worried. Still doesn't mean it wasn't charging.