"Go through the correct door? It's door number 4 right?"
"I'll go through door 3 to verify"
"Welp, that was wrong, we failed the quest, now we can't complete it"
Why did he just assume he could continue on as normal from there? Even afterwards, he says 'it SEEMS we can complete it by defeating the beasts', he just intentionally failed there, when so much is at stake. True MC energy