I've rewatched.
My clearly expert
opinion is that;
Rick hurt his hand with his knife, he's not bitten. He's just wounded. Then he gets attacked by the Wolves that Morgan let go.
Nicholas must have fallen on top of Glenn. He was covered in blood from the bullet wound, though, so hopefully he'll be able to do that "covered in guts" thing and be undetected, hence not having his face or legs eaten. He looked pained like he did when he watched Noah die, rather than like you would if your guts had somehow moved into your chest and were being eaten. He'll get under the dumpster, the zombs will move towards a sound - Darryl going past to save Rick? Rick shooting? Something at Alexandria? And Glenn will survive.
Rick is going to be even more convinced that they need to stop saving people and be ruthless, if he finds out that Morgan let those exact walkers go. He probably will, because of the baby food. I wonder if Glenn would go the same way? He's the only person not to have killed someone yet, I think? It'd be a big change.
Next week did seem to be about Morgan but I don't think it looked like a flashback. I'm hoping to god that it's not...we're probably due back at Alexandria, though, so I'm thinking it'll be about Enid and Carol etc, rather than finding out what happened to Glenn or Rick.