To me, that looked like the start of a punch that Jordan Hamilton thought better of before it landed but couldn’t stop.
And Hamilton is going to get suspended for that.
Less than a minute into the fourth quarter of a game where the Thunder were in control (up 10), the Thunder were heading back up court and Steven Adams set a little screen/bumped into Hamilton and Hamilton responded with a closed right hand to Adam’s chest. It wasn’t a good MMA punch or anything, but it was a swing.
You can be sure the league will see it that way and come down pretty hard on Hamilton (well, as much as you can predict the league and its fines/suspensions policy).