Because while it does have outlandish stuff, they could die. Even the greats ( hashirama Hiruzen) died. In part 1, if somebody got hit with a fireball dead on and there wasn't a med nin around, they'd be in trouble, let alone being crushed by a boulder. I mean heck zabuza got stabbed and he died. By the obito logic he could've survived somehowWe're talking about a world where people teleport, walk on water and breathe fire but surviving a boulder landing on you is ridiculous?
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