Turns out my first instinct was right. The guy pulled a power trip today, saying he wanted me to fire my PA so he could hire his. So we replaced him instead. I'm smart enough to know I'm not God's gift to production coordinating. Too bad he's not smart enough to know he's not indispensable either (actually, he said he wasn't sure he wanted the job anyway, so maybe he doesn't consider it a loss; however, I know at least two people now -- myself and the producer I'm working for -- whom if asked by another company whether or not they should hire this guy would recommend against it).