My impression from the video:
I don't think Tigger made an intentional punch to Jerry Jr.
It looks like that, for whatever reason, Tigger was trying to turn to his right and remove his back from being accessible to Jerry Jr. When he turned, his left arm was raised slightly and when he turned, his hand made contact with the kid's head. It doesn't appear intentional to me at all. With the giant head, I doubt Tigger would have been able to make an intentional hit to Jerry Jr's head.
It looks like Tigger was trying to avoid something. Real or perceived? I don't know and I don't think it matters.