The thing is, we don't know how much time has passed. It seems like this entire season has been over the course of a couple of days. Daryl, Sasha and Abraham are in that gas truck, I'm guessing what we saw with the end of last week's episode was their count of the same time we just saw Enid and Glenn. They get the "help" call, which could be the jerks that stole Daryl's stuff, could be Glenn, could be someone in Alexandria, now that the tower fell.