I don't think that showed any indifference. It really was tough to tell what he was doing, but I will point out that ever since he came back from the concussion, Scal has been very reserved in his celebrations. In particular at the begining of games, when the team does a bit of a mosh pit, he stays off to the side, and mock chest bumps with everyone. I would not be surprised if he was hanging back for the same reason, he did not want to get hit in the head by accident during the celebration.
I did notice something I had never noticed before in that video though. When Davis ran behind the bench, was he going to Bill Russell? It certainly looked like him.