Okay you clearly DON'T remember how it went down. Manu wasn't even shooting, it was a loose ball and Manu was going forward toward the basket from the baseline after collecting the ball, while Artest was behind him trying to reach for it. I'm not saying it was totally unintentional, Manu might have been trying to send Artest a message early in the series, but the plays really weren't very similar at all.
Afterward, in the 3rd quarter when the game was a rout, Artest did indeed look for revenge. He looked behind him to see Manu chasing his guy off a screen, raised his elbow at just the right time, and turned his head away at the last second in a weak attempt to fool the refs into thinking he wasn't looking and it was an accident. It was like those no-look passes people throw where they're looking the whole time until the last nanosecond at their target.