If Glenn is still alive,it won't be because of a dream sequence. Also,if Glenn was out of bullets,that would explain why he didn't try to "off himself" if he was being eaten by the zombies. I still say that he was surrounded by 10-20,000 zombies,so no single person would be able to rescue him,BUT a group from one of the soon to be revealed neighboring communities(who the actor was revealed to play said group's leader,but I forgot who he is),NOT run by the Wolves,could rescue both Glenn & Rick.