Groce did call a timeout. Terry Weimer was standing right in front of him and just chose to ignore it and admitted as much to Groce after the game. I guess he was just too caught up in the moment.
You'll have to forgive him, his wife just gave birth to their first child. He is a little busy right now. There will be time to make his first public appearance soon enough. I'm sure he is taking care of the important issues impacting WBB.