[1.0.4] Arena dinosaur counting bug

[Doctornull]

The Arena seems to suffer from the same flaw as the computer on Jurassic Park: it counts up to the expected number of items, in this case kills, and then declares that it's found everything even though there may be more monsters left over (due to monsters splitting or summoning).

Instead of counting up to the expected # of kills, it would be nice if the Arena were coded to end a round when no enemies exist any more.