Mozenrath is oddly confident that Aladdin won’t allow his friend to be the Thirdac’s next meal.

Because I spent so much time criticizing his little “hiring test” earlier I kinda had to roll over in my head the reasons why he’d be so confident – other than the fact that his ego seems to depend on not being wrong, ever.
Crappy exercise though it was, he could learn enough from his first encounter with Aladdin to come to this conclusion: 1) Aladdin said he would only risk his life to save others. 2) He demonstrated this when, as the creature came after him one last time, he put himself between the monster and the woman with no protection whatsoever, meaning he was brave enough to shoulder extreme harm to protect the life of a complete stranger and her sandpaper-voiced monster baby.
Now, I could be a little less harsh on Moze’s judging criteria and say he probably might have picked Aladdin on that merit alone in case he had to go back in there with him. If he was going to have to risk it and he was hiring help, pick the help that might feel inclined to try to save you if a monster gets the drop on you.
But I’m not going to give him the benefit of a doubt on this one. There was no way in Hell he intended to go back in there before the Thirdac had a collar on.

I also like to think that he snapped at Xerxes for “not being quiet enough” because he kept interrupting his monologuing earlier.