Yes ,watch it again and tell me if they do allude to it . I don't have it anymore since that was two weeks ago.
Okay, just looked at the scene again.
I know it's a three episodes ago, but giving anyone who hasn't seen it yet a SPOILER ALERT. I am going to detail a scene from early in the first episode of season 5
SPOILER---SPOILER---SPOILER
After Rick and gains consciousness as he is being dragged to the trough, he sees a person being butchered. One person is butchering the body on the table, the other is using some sort of cleanser/bleach/liquid substance in Clorox type bottle and pouring the liquid over the stump of the amputation and on the blood on the floor. There are several other bottles of the substance on the floor next to him under the cutting table.
Rick and the other 7 people (8 total) are lined up at the trough. Guy is warming up with the bat and other guy is sharpening the blade.
Guy with the bat is very precise in hitting the first three victims square at the base of the scull (well above the neck, but below the back of the head and in an upward motion as if to go through the eyes. The guy with the blade then slits the throat of each of the first three.
The head guy comes in doing an audit of the shells used. As they are discussing the shells they take are of the 4th person at the trough. They get ready to do Glenn when the auditor guy stops them to talk seriously about whatever (unimportant to this point).
The auditor guy and rick have a conversation about the bag of ordnance Rick hid. When they get done with the conversation, the auditor guy says to the two killing the people at the trough: "You have two hours to get them in the dryers and then we go to public face. Now's the time we can get messy, but we need to dial it all in by sundown."
SPOILER----SPOILER----SPOILER---
I guess what I remember is "You have two hours to get them in the dryers." but the context of that seems to be more of cleaning up for public face rather than zombie prevention. Could be both. But I still think a thwack that bad with that 36" aluminum softball bat to that spot of the head is enough to kill the brain stem.