would it be possible for the blood to come from the brain though? i remember in the Butterfly Effect the main character goes to the doctor who tells him part of his brain bleeds during his time-traveling, which led to his severe nosebleeds, but i’m not sure about the medical/physical accuracy
Yeah, cerebral hemorrhages are a little bit more dangerous than just a nosebleed. Specifically, these can (and usually will) result in strokes, brain damage, and death. In other words, not a medical condition you want to screw around with.
I can’t remember if I’ve ever actually watched The Butterfly Effect, so I don’t remember if that was explained in the film.