You help him fighting his ennemies, he captured you to put a tadpole in your head but he finally decide to attack you ?
It does not make sense at all. We could eventually stated that the tadpole does not have the expected influence because fighting Zalk and the 2 cambions is not EXACLTY the order he gaves you... But it's really something the player has to think about, not something that makes sense considering the story telling.
Im talking more about the fact that he is facing actual threat ...
Even leaving aside the fact that our hits are hardly compareable with mosquito bites ...
And on other side we have Cambions, that are theoreticaly able to down him within few rounds.
Yes, clearly we are not obedient slaves ... but so far we are acting in his interests, wich is survival ... therefore he leave us be, until he no longer needs us, precisely as he say.
Simple as that.