The best player of the opposing team leaving the match? Absolutely no problem to celebrate. It's not like he had a career ending injury, dont over react. I was watching a 15-minute video about the game and I was smiling after he left (I kinda prefer the Raptors, but dont really care, and this going to game 7 would be great). And as far as I know noone did anything to him. The Salah injury in last year's CL was a moment where you should be a scumbag to celebrate, or Neymar's in 2014 WC... Durant? Naaahhh. Dude probably rushed his return and this was a risk.