First of all, don't apologize, rambling shows you are thinking of the story, that's why I also yap when talking about manga, it also makes it feel collaborative to theorize and discuss it with others.
About the point of view of the vice-director, He is being hasty, he heard 1 report, from 1 teacher and decided to fire the MC, not asking him what was happening, not trying to investigate asking other teachers about it, just 1 report from the gorilla idiot who is salty because he was proved wrong about his views on life magic, if the vice-director asked the other teacher who went with them to the dungeon, he would have heard of the quintuple push, and how the MC was right, or could have asked the MC for a demonstration and proof, or could have just investigated, notice that the MC managed to climb a lot of adventurer ranks (for a magic life user) and do a logical conclusion.
Though I also have to cut him some slack, he was just ascended to director even if temporarily, he already gotta be stressed and now the MC is going around saying that life magic can be used to explore dungeons, and while I'm just theorizing as I'm not a LN reader, I also think he could be biased against the MC since he was a nobody whose only worth was being the adopted grandson of the director of the academy, for all the vice-director knows the MC is just a nepotism hire who is way over his head and was abusing his position.
