Talk:Episode 12: Dogma in Ergosphere/@comment-2.49.155.176-20151025180032/@comment-26377724-20151026100531

2 theories for that little part for me:

-It's purely symbolism like you said first, Okabe had already crossed the line and it's the final warning before the doom (and the death of Mayuri). Others symbols are the Hourglass and the pocket watch.

-Reading steiner side effect, he can see what happenned in a worldline he hadn't crossed yet or will never cross, where Mayuri is sent to the past with Okabe 70M years earlier. It's exactly the same he happened to him at the beginning of the film when he see several alternative pasts he had never see himself (the psychopat Nae in Moeka arc and the cycling ride of the Suzuha ending)

Personnally i prefer the second solution, and this solution imply one day we will see in an yet unknown story, an okabe travel back in time (by mistake or not) with mayuri 70M years in the past.