User blog comment:Sokatsui/Time Travel Paradox/@comment-4139585-20130130014552

Haven't read other comments so I'm not sure if other people have said this or not, but my belief, as seen in other shows and other things in general, is that time is simultaneous, not sequential. The Future happens at the same time as the past; ie, Impulse already went back, and at the corresponding time in the past, the world would have been bad; however, he cannot reverse and leave because it has already happened.

Just to explain what sequential would mean, it would mean exactly what you said. Changing the past changes the future, but, as I said, this in most likely not the case...

Or everything I said could be null and void because Green Beetle most likely most likely put the Scarab back on mode. Oh well, my lengthy explanation goes to waste...