Well, first thing this morning, the guy pulled me aside and appologised for his behavior yesterday. He said it was a huge overreaction and he was out of line. I agreed and accepted his appology and told him I am not tolerating his behavior.

The boss called and asked what I wanted to talk about. I told him that we had an issue yesterday and everything is 100% ok today. I'm sure he'll ask more later, in which case I'll say You-know-who was just being his normal self. The boss guy will laugh.