Board Thread:The Flash discussions/@comment-9346948-20160420004341/@comment-2112031-20160422112958

I think I kind of understand how Time Remnants work. When Barry traveled back in time in "Out of Time" and "Legends of Yesterday", he replaced his younger self, without being affected by the disappearance.

I'm guessing Zoom did something similar. But instead of replacing himself, the two versions managed to exist indepent of one another. Which is why the death of the younger Time Remnant, didn't affect Zoom.