Matt already had some prejudice against the director. Since Aria Grant wasn't here, Matt really couldn't control his emotions and was afraid that he might have a conflict with the director.
So, to be safe, Matt left at this moment.
Matt wasn't in the mood to go home right away, so he went to Butterfly. He thought he should talk to David Thompson about it, otherwise how much worrying would he endure, he couldn't let Aria be mistreated out of the blue.
Fortunately, David was at the company at this moment. Seeing Matt coming to look for him, David was puzzled. Shouldn't any issue be communicated directly through messages?
"Matt, what brings you here? Is everything done at the set? And was it smooth?" David hadn't been home all the time. Thinking that it was time to start working, he had come to Butterfly.