Detroit Bad Boys reports that Billups will continue to play, even if that isn't the best idea:
As much as I’d like to pretend otherwise, it’s officially time to ponder whether Chauncey Billups is healthy enough to make any kind of sustained impact in this series. I thought he turned a corner in Game 2, but in hindsight it seems more likely that a) Game 2 was a mirage; b) he aggravated the injury in Game 2; or c) some combination of above.
Whatever the case, Billups is intent is playing on.