I just saw the clip on our local news. The boy has his arm around Tigger - up kind of high. It did look as though Tigger put both hands to his throat (when the kid was pulling hard on his mask?), and as he was trying to turn toward the kid, the kid had quite a hold on the back of Tigger. That's when you see Tigger hit him in the head. My guess is the kid is a jerk.
"Hit" is too strong of a word for it. "Touch" is more appropriate. The dad said he "clocked him in the face".