Hey, the dumpster was supposed to up against a barbed wire fence...now there's no fence? IT'S A TOTALLY DIFFERENT DUMPSTER, GUYS! Glen's totally alive!
Seriously though, I hope next week is 90 minutes of Glen getting eaten piece by piece so there's no ambiguity.
There's a quick angle when they first get up on the dumpster that shows that it's not flush with the fence and that it got somehow engulfed by the walkers in the span of two seconds