It was a half-assed rotation (i.e. not completely stepping up to take the charge on Felton, or not sticking with Chandler like glue). He was literally caught in no-man's land on 2 straight possessions in a vital stretch of the game.
And it was half-assed as you say, how do you qualify the effort of the other Raptor that did not even appear in the picture?
Bargnani rotated - whether well or not - and someone else obviously did not.