Yeah there's always a replacement ref on standby just in case someone gets injured or has an emergency.
Those refs were terrible. One play that pissed me off the called PJ for an illegal screen... Matt Bullard said that when you're setting a screen behind a defender you have to give him a step you can't just run up his back. PJ went to set the screen but he extended his arms to touch the defender then stopped, so he was at arm's length from the guy he was setting the screen on.
The very next play, Dallas goes down and a player set the same exact screen on PJ, exactly the way PJ did and there was no call. PJ ended up falling down and Ray Allen..... ohhh eerrrrrr..... wait..... I mean Tim Hardaway Jr. hit a three.

Lead jumped back to 6 points