Just to be clear for anyone that has said something to the effect of I'm not sure he took two steps before the jump stop.
If you take any steps and then come to a jump stop it is a travel (provided you had picked up your dribble before the step).
TP to MaxwellSmart for looking at the replay in slow Mo. Watching it live and seeing Delonte look up right after the call (as if he was a soccer player for Barcelona) seemed suspect. But if you watched it in slow Mo and are confident that he was hit I will trust you.
You are right about Mo Williams, Pierce was clearly trying to grab him to stop him and hold Mo up. Mo made the conscious decision to fall to the ground to see if he could draw flagrant or a tech.
The NBA playoffs, where acting happens.