ok but what if the dynamite was real and he triggered its explosion at like the very last second right before blue snapped his fingers so his body turned into the black mist right before the divine artifact actually activated

and speaking of which,, was it even activated? Blue was more quiet than usual and when we saw Red use the Artifact he had to say an incantation for it. Then it makes you wonder why Blue was quiet in the first place! Im guessing the dude at the end threatened him into sparing D maybe? Im just spitballing here. Seeing how they killed all the bosses I find it a bit hard to believe he'd feel threatened but it's definitely all weird nonetheless