Night of the Living Dead

Ben believes the cellar is a death trap because it offers only one exit, making it a literal trap if the zombies breach. Once inside, there would be no escape route if the undead got in, whereas the barricaded house provides multiple defensive positions and windows to escape through if overrun.

Tom attempts to shoot the lock off the gas pump to get fuel for the truck. His rifle shot hits the pump mechanism, igniting gasoline vapors and causing a massive explosion that kills both Tom and Judy instantly.

Sarah was bitten by a zombie earlier in the film. The movie establishes that anyone who dies while infected, whether from a bite or otherwise, will reanimate as a zombie. Sarah succumbs to her wound and returns as one of the undead, attacking her own mother.

Harry takes Barbara's gun during the escalating chaos because he becomes increasingly paranoid and desperate to protect himself and his daughter Sarah. With the group fracturing and tensions high, Harry prioritizes having a weapon to defend what he sees as his only chance at survival.

Barbara kills Harry as vengeance for his role in the group's destruction. Harry had repeatedly opposed Ben, took her gun, and contributed to the internal conflict that led to multiple deaths. After finding him alive in the attic while Ben had turned into a zombie, Barbara shoots him, securing her survival but also sealing her fate as the sole hardened survivor.

Helen was bitten during Sarah's attack on her in the house. When she dies from the wound, she reanimates as a zombie in the cellar where Ben had taken refuge. This forces Ben to shoot her as she lunges at him, adding to the night's tragedies.

Helen is bitten by Sarah before Ben retreats to the cellar.

After the violent confrontation leaves both Ben and Harry seriously injured, Ben retreats to the cellar as a last refuge. Despite his earlier warnings about it being a death trap, he has no other option as the house is overrun and Harry has barricaded himself in the attic. The cellar offers a temporary hiding place, though it ultimately leads to his doom when Helen turns there.

Ben's earlier warning about the cellar being a death trap proves ironically justified.

Barbara survives because she leaves the house to find help while Ben stays behind. She encounters the zombie hunters and returns with them, avoiding the final confrontation inside. When she returns, Ben has already turned into a zombie, and she kills Harry, making her the sole survivor of the group's tragic night.

Ben succumbs to his injuries from the fight with Harry. Like all infected people in this movie universe, when he dies, he reanimates as a zombie. When Barbara returns with the hunters, Ben emerges from the cellar as an undead creature. Though he appears to recognize Barbara, he is shot before any recognition can be confirmed.

Barbara decides to leave because the situation inside the house has become unbearable. With Harry barricaded in the attic, Ben losing his sanity in the cellar, and the group completely fractured, she concludes her best chance is to venture outside and find assistance from anyone who might be alive.

The local zombie hunters plan to burn the bodies to prevent any chance of reanimation. This is the group's method of ensuring the dead stay dead, cremation eliminates the risk of the undead rising again, which has been established as a constant threat throughout the night.

Barbara's final line reflects her complete transformation by the night's events. After witnessing nearly everyone she spent the night with die and turn into a zombie, she has become hardened and cynical. The line acknowledges that Ben, someone she cared about, will now join the other burning corpses. It underscores the bleak, hopeless tone of the film's conclusion.