If you're running flat out it doesn't take much a push to lose balance and go over. Of course, forwards milk that too, but it's why a lot that are called dives really aren't even though they aren't penalties either. Thought this one was, mind.
I can't believe it was given. Calvert Lewin stopped chasing the ball a soon as he got his body between the player and ball. Then stopped, and threw himself to the ground. Never a pen for me but hey ho