It’s one thing to nail someone with an uncalled illegal screen as Draymond Green does at the beginning of this play. (He was clearly moving). It’s another to respond like Matthew Dellavedova does. Retaliation does not mean ducking your head into Green’s knees. That’s not a basketball play. That’s why Dellavedova has a reputation for being dirty.
(Credit to @Marco_Romo for noticing this.)