A playcalling question

I'm on record as saying playcalling is difficult because just about every call can be second guessed. Well, I'm second guessing. The Cowboys open the second half on their 3 yard line thanks to Terence Newman not fielding a punt properly and assistant head coach Jason Garrett calls a delay run. Why? Why have a long set up to a running play that close to the goal line? Glenn Dorsey hit Marion Barber at the goal line but he was abel to spin free with a little help from Flozell Adams to get to the 1.