I can't find a video on Youtube, but at the start of the 4th quarter, JB was still in the game. Good for him to return to the game, but he did look "down" (he kind of jogged following a steal and fast break). He got subbed out after a minute or two and went to the bench. At that point, Avery Bradley walks down the bench, sits next to JB, puts his arm around him and talks him up (patting on chest, etc). Definitely looked like a big-brother pep talk to JB. I was hoping JB came out again for some meaningful minutes, but I don't believe he did.
That's AB being a team leader.