He knew what he said to Marcel was wrong, and he felt really bad about it, but he never says sorry, so he made sure he avoided him throughout the rest of the day. Pretending to be very busy and not sitting in his office.
After work hours where over, he knew going home meant facing Marcel, so he didn't want to go home, because he knew he'd have to face him. Even though he locked himself inside, Marcel had the keys to his house, so there was no escaping.
The best thing to do was stay at work and get busy. And probably when it was past twelve, he'd head home. Marcel would have been asleep by then.
Inside Dazzle, he had his own little workshop there. No one else was allowed in there.
He was the only left in the whole department. Every other person had gone home for the day.