Freshmaker
I am Korean.
What do you think happens to last week's timelinewithout Barry? Does Wells go batshit crazy and kill everybody? Is Wells exposed? Is Joe permanently disabled? Is Coast City underwater? No Flash means Wells is stuck permanently. This is one way to extend the season. Hopefully the writers retcon this in a way that closes the time travel loophole before this series turns into Heroes with the fuckery.
Well, Barry already knows most of what's going to happen, so he could check most of the damage before it happens.
Or else he'll try to get back, travel back in time, get his past resolved and return to right when he left.