That's a different kind of white mage. I expected something more along the line of : https://mangadex.org/title/45987/story-of-the-white-mage-who-can-read-the-swordman-s-heart
@RamenRider He's thinking of how to kill her if she's an enemy though, it's just he lacks the MP due to the princess sulking. That's the whole reason he tried to guide her as deep as possible into the dungeon. Rather than due to the honey trap, I think he's more of careless about his fundamental weakness(lack of mana when he separated from the princess)
@Kuraiaku
He had MP before she chained him up. The barrier purified it and damaged him.I get that you're trying to imply that he simply didn't have enough MP, but the barrier itself was burning MP simply by existing. Even in a best case scenario, she could simply burn out all of the mana from the trap that actually hit her via using even more of her holy power like how she damaged the monsters. Your attempt at an explanation does not cover how the scenario fails on a fundamental level with the facts given to us.
This is the first time I've seen a yandere willing to NTR her dead target in order to get his attention. That's a power move, all right. Alpha White Mage indeed.