There are 3 possibilities shown in movie. In one scenario, old Joe is killed as soon as he appears in the field. In 2nd scenario, he turns his back and survives. In 3rd, things change as young Joe kills himself.
I'm confused about 1st and 2nd scenarios. I mean when he was killed in 1st scenario, how come he came again to past from future?
Was it the concept of time travel that once your old self is killed (i.e., closed loop), he becomes alive again in future and possibly that's how he managed to go back into past again?
Does it mean, it will keep happening again and again as long as young Joe keeps killing his old Joe? If yes, it quite doesn't make sense, because this way, the old Joe will never die in future unless natural death causes.