Jesse had been in the shower while all of this was unfolding downstairs, and he missed most of the confrontation. He did, however, hear JJ start to raise her voice, and that brought him running. Unfortunately, he had no shirt on and his hair was dripping, which probably wasn't making the best impression.
"Uhm," he said, feeling very clever. "Hello." He turned to JJ, concerned. "What's wrong, are you OK?"