I was fooling around with BreakingNYC's laser, and all of the sudden, both my splitted rays stop in thin air, probably because too much refracting. Why?
Not a glitch at all. Energy particles like Fire, Photons, and Neutrons all have a preset lifetime called Life. The life value for a photon when it is made is about 700, so it will live for 700 frames before suddenly poofing.