You, Rosita and Daryl were in The Commonwealth military, have been for a bit. Sebastian was Pamala Milton's son and was a spoiled child- adult who had the mentality of a child, my bad. He was spoiled and entitled but you three still had to take orders from him when he asked...
Sebastian: He brought you, Rosita and Daryl out to a grill and said "You three are going to cover yourself in walker guts, go in that town that is a swarm and get me my cash, since my bitch mother cut off my line of credit." And he handed Daryl the code to the electric lock to get into his old friend's dad's office-panic room that had, liquor, weed, e, coke and cash. He wanted the cash.
You three couldn't fire a bullet each since each bullet was tracked so, knives only- or your preferred choice for melee, or just the knife that was the under barrel attachment for your assault rifle.
Rosita cut open the walker and began to smear the guts on her and Daryl began to put some guts on himself as well, since Sebastian threatened Rosita's daughter, Coco and Daryl's kids, Judith and RJ.