Credit: Gene Page/AMC Photo: Carol Sits in a Cell in The Walking Dead Season 4, Episode 3: “Isolation”

The mystery of Rick Grimes’ (Andrew Lincoln) busted hand may be solved in The Walking Dead Season 4 Episode 3, “Isolation.”

Based on previews which show Tyreese (Chad Coleman) banged up, and a photo of bruised Rick, they appear to get into a scuffle and Rick may slug the grief-and-rage-stricken Tyreese, hurting his hand.

Also this week, Tyreese goes on a supply run with Daryl Dixon (Norman Reedus), Michonne (Danai Gurira) and new guy Bob Stookey (Larry Gilliard Jr.) — and they drive into a major herd. The extended Comic-Con preview showed Tyreese hammering away at a herd of walkers during the supply trip, and it looks almost like an “I don’t give a bleep about anything anymore!” suicide act. We’re thinking he lives through that somehow, especially since another scene shows him with Michonne and company in what looks like a school or other building.

Back at the prison, they’re trying to deal with this new illness. As the “Isolation” title implies, the group is trying to separate the sick from the healthy, which may not work for long since this sickness is spreading all over the place.

We’re certainly worried for Sasha (Sonequa Martin-Green), since a preview showed Tyreese’s sister looking pretty sick. Still, that preview may have been set up to intentionally mislead us into thinking she’d be the next to go. We’re also worried in general for Hershel (Scott Wilson), since he not only makes a speech about sacrifice in the promo, but there were rumors over the summer that they were having a death dinner to send off his character. Those were just rumors, but they may have been accurate. It doesn’t mean Hershel will go this week, but it’s possible he won’t be around for much longer.

A main character may not die this week, we could just see more “redshirt” deaths — as in, anonymous or mostly unknown people whose deaths just emphasize how high the stakes are for the more major characters. We’re expecting to see more deaths like Zack, Patrick, David from the Decatur group, Lizzie and Mika’s dad, and other people we never really knew well anyway. Maybe Dr. S.?

But “no one is safe” so even if, say, baby Judith dies this week we’re going to be completely devastated ... but not too shocked.

The Walking Dead airs Sunday nights at 9 p.m. ET on AMC.