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hiro chan new theory is that the sound that made people go to tothe crime scene wasnt something that actually ahppened but a sound file like its ring tone its a ringtone or alamr played from a device like aphone, so the killec could have triggered it from any where, so the logic of the one being there being the killer is kill, speaking of which, ema points out, meruru smart phone is missing from the scne, so there was no device to play the audio, given the times though, someone else could have been the killer
