Did injured Rajon Rondo try to trip a Celtics player?

Rajon Rondo is out indefinitely after fracturing his thumb in Game 2, so he watched Game 3 from the bench in a short-sleeved blazer that looked similar to what Dwyane Wade wore when he sat out with an elbow injury in March.

But anyway, in the first half, it looks like Rondo may have tried to contribute to what was happening on the court by, uh, trying to trip an opposing player?

Maybe Rondo was just stretching, though, you never know.

Going into this game, the Bulls have a 2-0 series lead on the Celtics.

Update: After the Celtics won Game 3, 104-87, Rondo said he was just stretching.