"What huge, well-fed predators."
-- Mysterius, is he really that mysterious? I think we'll become good friends.

Mysterius
Kills one enemy in battle, provided that the enemy is "unnamed" or does not pose a significant threat as an opponent.
Added 4 minutes later
Let me explain with an example. If it's some guard #598 or someone like Antonius, then the cat can kill him. If it's a named fighter, then it's unlikely.