Sorry, I didn't mean to come off like it sounded. I was just a bit frustrated because so many posters are posting wrong information. Anyway, there isn't 100% agreement but one reliable source says that once DA secured the ball inbounds (Matt Jones also said this), it eliminated the SC coach calling a timeout. Other sources say that once DA stepped out of bounds with the ball, it eliminated the timeout option for SC.
After watching the video multiple times, the timeout was being called when DA was still inbounds with the ball, IMO. However, it was a bang bang play and the ref was walking away with his back to the SC coach as he was calling the timeout. No matter how you look at it, it is obvious that Sendek should have tried to call the TO sooner and he should have been further down the court. He was somewhat camouflaged by the bench, IMO.