Celtics coach Doc Rivers defended his players Thursday morning on WEEI’s Dennis and Callahan Show, placing the blame for a 2d-quarter fight on Nets forward Kris Humphries while also acknowledging that Rajon Rondo needs to better keep his composure.

“Humphries was at fault,” said Rivers. “The foul was what precipitated everything. They called a flagrant to begin with. That started it. But then we took it to the next level.”