Talk:The Cutie Re-Mark - Part 1/@comment-1023843-20151214230608/@comment-5837525-20151215000029

Yes, it is. If one goes into the past and kills one's grandfather, thus preventing their own birth, they wouldn't be able to travel into the past to begin with because they no longer exist. If they do still exist, then the initial attempt to kill their grandfather had to have been unsuccessful.