This ain't convincing. He shot her kneecaps, if her escaping was a concern, then he would've just proceeded to break her arms or something. Also, this is a magic world, there has to be some sort of sealing magic or something. I am doubtful she would be able to escape, demons may be powerful but humans have been fighting them for millennia apparently: they must have some trick up their sleeves. Also, why would he care if she rampaged throughout the capital? To save his waifu? What now, is he going to babysit her? Cus she's never going to be out of harm's way. Only reason I can entertain is if he wanted whatever info he can find on demons for himself, but still: wouldn't he have tried to extract more intel? Yeah this feels cheap to me