I thought this was another great episode.
I can't figure out what is going on with Abraham, except I want to see him kick somebody's ass. I've always loved Michael Cudlitz as an actor, especially in Southland and Band of Brothers. Hopefully we'll see that before he meets his demise.
Tactically, they did everything right. You have to leave security back at your vehicles for your return trip, otherwise it could be an ambush in waiting. However, the personnel choices left something to be desired and this certainly sets up Glenn for a head bashing. (Yes, I am well aware in the comics he gets offed). I love his character so I don't want to see him go.
Bill, I'd guess if you penetrate the brain quickly, there won't be any sound or screaming. Is it possible to get a clean knife through the eye kill? Yes...very likely without noise, I doubt it. But then again, headshots through the eye drop a person on the spot. There are many, many factors that would go into that.