It depends on which of the two was leaving the building.
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Anonymous What does leaving modify?It's impossible to say. That's why it's a bad sentence.
Anonymous"He" not "him".Since this is the case, there should be a comma there.I'd say the sentence was even worse with the comma. It's quite rare for a comma to be able to fix logic problems.
AnonymousDoes my example work?Which example? Do you mean the one with "after"? Yes, that works.