Frank decides to investigate the source of the sound and starts to walk around the store. As he sees that a can of food is rolled next to him he turns around and comes face to face with Steven Chapman, the manager of the supermarket. He has gone psychotic and is protecting his store from anybody who tries to "vandalize" it.
He confronts Frank with a reinforced shopping cart that holds Isabela in it. Frank explains that someone's been hurt and he needs medicine, but Steven says that was what Isabela said when she came to "vandalize his store." He then declares that he doesn't allow "vandalism" in his store and attacks Frank.
After he is defeated, Steven drops the Pharmacy Key. Frank recognizes Steven's hostage as the woman he met in the Entrance Plaza, and helps her to her feet. Isabela recoils, saying that she doesn't need help from him and that his people ruined Santa Cabeza.
Frank turns around to find a man pushing a shopping cart with blades along the side, with a woman inside of the basket.
Steven: THIS IS MY STOORE!
Steven: You came to vandalize my store, huh?
Steven: NOT ON MY WAAATCH!!!
Frank: Someone's been hurt. I need medicine...
Steven grabs the girl and shakes her head.
Steven: THAT'S JUST WHAT THIS BITCH SAID WHEN SHE CAME TO VANDALIZE MY STORE! I don't take kindly to vandalism. I will not allow it! Listen to me, and listen good partner. I DON'T VANDALISM IN MY STOOOOOOOOOOOOOOOOOOOORE!
The crazed manager of Seon's, Steven has a modified cart with Isabela Keyes unconscious inside. She is the woman Frank saw in the Entrance Plaza cutscene just before the undead hordes swarmed in.
As soon as the cutscene ends, jump up on the aisle shelf to avoid Steven's cart.
Steven's main attacks are his:
Cart slap, and
A sudden dash toward Frank with lightning speed. His cart dash will leave him wide open for a firearm attack afterward, since he will probably be a distance from Frank.
Shotgun, which is the most deadly. Steven will sometimes stop pushing the cart and aim his shotgun at Frank. Be sure to get behind a aisle when he starts shooting and do not try to sneak up on him while he is shooting.
Steven has a shotgun for when Frank is out of range. But fortunately, the store has plenty of cover with aisle shelves, as well as plenty of food to replenish health. Don't give Steven the opportunity to shoot the shotgun by lingering on top of the shelves for too long. Drop into the opposite isle and make Steven move toward the checkout counters. The checkout counters offer Frank his best chance at survival. The counters act as a barrier between Frank and Steven, allowing Frank to shoot Steven safely from the other side. Steven will just continue to try and ram Frank with the cart.
Steven's shopping cart is very slow to turn, so start off by running down the aisle away from him, then duck to one side and stand a couple of aisles over with Frank's guns out, waiting for him to come out. Fire a few shots and then duck back down another aisle then repeat. If Steven's cart is getting too close, Frank can also hop up onto the shelves and into an adjacent aisle; while it might be tempting to stay up there, Steven will just resort to his shotgun.
Small chainsaw or katana strategy
It is possible to get behind Steven to use melee weapons, either by outrunning him or using the shelves (he cannot turn around once he is down an aisle) but it's really not recommended as your first course of action unless Frank has a couple of katanas or the small chainsaw. Steven can be defeated with two or three quick swipes with the Small Chainsaw.
Store weapon strategy
If Frank didn't bring a decent weapon into the grocery store, try to use the drink cans on the far aisle next to the bread. These cans work surprisingly well at damaging Steven if Frank hits him with several cans in a row.
Isabela disappears after the cutscene. Frank receives the pharmacy key from Steven's corpse. He can now open the pharmacy door. Like all psychopaths with unique weapons, Steven leaves the weapon cart for Frank. This weapon will now respawn every time Frank leaves the store and returns.
Enter the doorway between the meat and seafood counters in the back. Follow the corridor all the way along.
The pharmacy key is automatically used when is pressed.
Go into the pharmacy and pick up the medical kit, which Frank needs to bring back to the Security Room. Exit the supermarket.
Return to the security room to check on Jessie and Brad. As Jessie is sitting on the couch next to Brad, Frank can get the erotic photo for Kent Swanson's Photo Challenge.
Speak to Jessie in the Security Room to hand over the medicine. There is no end cutscene for this case.