OK, so I finally watched this. The last link in this thread didn’t work so I just found it on YouTube.
https://www.youtube.com/watch?v=ivEAGEMgBaUIf you watch it again you can see him visibly move forward an inch or two after the slap. So if you come up and just tap somebody on the back they’re not gonna move forward at all so I think the tap was much more than a tap it was a little bit harder than what it seems in the video. Was it an assault? I wouldn’t charge somebody with an assault for something like that.
Now, watch it again but this time watch the woman standing to Rudy’s left. She immediately reaches forward which tells me it was way more than a playful tap. she probably heard it and saw Rudy move forward which indicates it was a bit more than a tap. Again what is an assault?
But while there’s no sound, let it play through again and watch the people in the group. It’s clear the guy is yelling and I’ve read that he was yelling profanities. So to me when you put that together with a “playful tap” that pushes him forward an inch or two and the woman directly next to him recognizes that, I’d say again this is more than just a nothing burger