[Flame On]

Rick promised he would end him like that and hell he probably heard him essentially threaten to eat Judith and by proxy his son Carl.
Sasha just lost her bf and watched some of his last moments with more undue suffering thanks to the leg meal.
Abraham was all wound up by wanting to leave and took it out on these guys as admitted in his map message.
Michonne a bit of a departure for her to be so savage and not calculating.
They basically came back to people in their house threatening to eat their loved ones. Sort of had it coming. And yet still Glen and Maggie you could tell were slightly appalled so it wasn't the whole group turned savage, just a few, typically savage, members.