Double Elimination Chamber

So, a Tazar of level 20 will come to you and say, "Oh, by the way, I ate a Pandor." And you can't even verify it (I'm not a hardcore player who keeps track of where he attacked whom. Maybe he fought someone else to defend that Pandor). What's the point of playing as a mage then? It would be better to prohibit leveling up a Warrior above level 7, unless he is attacked by a computer-controlled enemy or an opponent.