Between NHL and amateurs, I have probably watched 3,000 games. Not once have I ever seen a player do that with his leg. And if you look very closely at the slow motion, he gets Adam directly on the leg spin then kicks again at him on his way down. There are two skate movements towards his head.
I have no idea how you see this as accidental, when he was BRUSHED - if that- but Adam's teammate, certainly not to the extent that his leg powerfully and directionally swings fully around and goes at a 30 degree upward motion.
I have seen hits where the player is fully spun around wildly, but due to gravity and physics, the legs are usually swinging level, or most of the time, downward.
This player swings his leg around and flings it so hard he flips himself to the ground --- not as the result of a check. Watch it again.