Board Thread:Council of Arrowverse Wiki/@comment-9346948-20180119051714/@comment-1783334-20180122012418

Stryzzar wrote: Yes, but only speedsters and time travellers would be in that situation to begin with. First, what part of it doesn't matter how often or how rare the situation is do you not understand? If it affects everyone the same way, it's not worth mentioning.

Second, if a speedster or time traveler wants to kill someone, they can easily travel back in time and kill the younger version or the ancestor of that person, they can travel back in time and perform either task and the person would be erased from that point in history and onward. Eobard was stuck in the past, yes. But remember why he was stuck in the past, because he wanted to kill young Barry. Before he traveled to the past, Eobard was facing Oliver, Ray, and Hawkgirl. Apart from Hawkgirl, if he went back in time and killed the younger version or ancestor of any one else there, they would be erased from existence as well. Also, let's not forget about the Pilgrim and the Omega protocol.