Hmm, ahahahaha! So what have we got here, eight people entering the room, laying eyes upon a human body! And there are only nine human bodies on the island! There’s no room for anyone else to be involved! So it can only be magic, riiiiiight?
Not when you’re dealing with the Ushiromiya Battler, logic twister supreme!
“The body the group laid eyes on actually was A’s body! But A was nonetheless alive and well! This means his body looked healthy, but the others nonetheless believed his corpse to be mangled! Perhaps someone said it out loud and the others could not get the idea out of their head anymore. EIther way, they convinced themselves that the body was mangled even though it technically looked healthy!”