boys from the dwarf: it will be cool to watch two monsters fighting then walk in near the end of the battle and take the EXP.
I'm gonna bet that this wont happen a lot later in the game. i'd guess you'll only see enemies fight each other in area's whare theres wild animals or maybey some plot fights where you interupt some people fighting.

although it would be pritty smart to swoop in on the kill, to snag some un-earned exp