Board Thread:The Flash discussions/@comment-4036559-20181010183851/@comment-3221148-20181010212358

It is heavily implied that this was when he time travelled back to 2000 to stop Thawne from killing his younger self. I mean, we know he was battling Thawne, when he disappeared, so this is where they likely went to. Yep, the question is: why didn't he come back? Perhaps it's the Flashpoint, since we haven't seen the Bright Red Suit Barry last time (and instead, Eobard was the one to kill Nora and bring Our Barry to 2016).