Jayson Tatum with the dunk and obvious foul ref blows the whistle then pretends he didnt after the dunk still goes in

Can someone enlighten me on what Jayson Tatum was trying to do here

Lavine feeds Carter Jr for the dunk to give the bulls a 1 point lead with 9.1 left

James Harden punches/elbows Talen Horton-Tucker

Tatum with a four-point play