Bro is literally the amazon equivalent of a driver wanting to speak to Jeff Bezos, then suspecting him of rigging the delivery chain. what in the actual fuck is going on in this manga?
That's a quandary he's found himself in. But it's also self-inflicted. He wanted to report the evolved boss, but now he suspects the guild master herself to have orchestrated it and suddenly gets cold feet about reporting. IMO he should still report it and see her reaction.
This chapter feels so cringe, from the way Elma is acting to the wild assumptions such as "you know your way around a dungeon" based off of absolutely nothing to make her seem as highly intelligent, it comes off more as the author trying too hard