I knew that nothing regarding Glenn would be resolved on the NOW episode, but hopefully will totally come to fruition within the next 3 episodes, or the show will lose many viewers if just left hanging. In my opinion, the only plausible way he could have gotten out of that situation to continue on realistically is to have pushed Nicholas off him & slid under the dumpster, which if you looked close at it , it is on legs & not flat on the ground & if there was a manhole cover or sewer under it to get into. Since even at the first episode (And the Last one) Tunnels & sewers were tried being used to get around, & if that was the case he could even follow it into Alexandria itself if it connected to the tunnel Maggie & Aaron were in. That to me is the only way, any others will not make too much real sense; just my opinion though. (ADDED 11/11) ***Also, I do believe that Glenn still does have that Flare gun that he & Nicholas were going to use to burn down that feed store and since a fire could be a short temporary diversion that would again attract many "Walkers" to could also work in his possible escape.