Cycle

Cycle Protagonist travels to the future. He comes out and finds a confused and nervous person. He seems to be suffering from memory loss. They walk around and come across what seems to be a harmless tablet-like device. Other guy is scared of it and has no clue what it is. Guy tries to explain what it is, but other guy doesn't seem to be any less afraid. Guy tries to use it to show other guy it's harmless, but when he starts using it, he quickly loses his memory and can't understand anything. He goes into a confused rage and kills other guy. He then wanders around aimlessly in the same state the other guy was in, towards the time machine.