At the very least this is an attempt at a free card by someone with the A[img]/images/graemlins/club.gif[/img] (this seems to be the third thing semi-crappy players learn, after the check-raise and slowplaying aces), and with low aggression he's probably raising his soooted K-rag (or slowplayed aces).

It's such a small pot I'm not sure I want to see how this movie ends.