That was pretty obvious, SFP... Acy was mad that Duke took a 2 possession lead and lost his temper and started pushing Smith (I think it was him?).
I thought it was a good call, though one not commonly made at a late junction in the game.
I think that the proper call would have been for the referees to warn both benches instead of issuing the technical foul.
Schreyer was also flailing his elbows around prior to Acy pushing Smith. I thought they should have called a double technical if they were going to call anything.