I thought the same thing. Even after the basket no one moved.
I thought it was 1 and 1, but when nobody moved, I started questioning why the ref gave him 2 shots, and totally missed the rebound putback.
I have to wonder, in the back of my mind, if the ref gave the correct signal prior to the free throw. For four people to just brain lock like that at the same time, is unheard of.