That hypothesis is one that I considered. However, Harry can see every other magical effect just fine; he has no problem with the Avada Kedavra or any of Voldemort’s special effects. Of course, if the memory is real, it must have been stored magically, and “enough magic to record magical memories but not enough to see the special effects” sounds like a very specific level of magic. The AK rebound, if it actually happened, may also indicate that Harry had enough magic for his resonance with Quirrell.
In canon, it seems to be visible. to Muggles. The scene where Voldemort kills the Riddle House caretaker seems to imply that (although not fully since it turns out we are getting the scene from Harry’s mental connection to Voldemort).
That hypothesis is one that I considered. However, Harry can see every other magical effect just fine; he has no problem with the Avada Kedavra or any of Voldemort’s special effects. Of course, if the memory is real, it must have been stored magically, and “enough magic to record magical memories but not enough to see the special effects” sounds like a very specific level of magic. The AK rebound, if it actually happened, may also indicate that Harry had enough magic for his resonance with Quirrell.
He doesn’t see anything a Muggle wouldn’t see. There’s no reason to think the green light part of Avada Kedavra is magical.
In canon, it seems to be visible. to Muggles. The scene where Voldemort kills the Riddle House caretaker seems to imply that (although not fully since it turns out we are getting the scene from Harry’s mental connection to Voldemort).