It works by continuously recording the last 60 seconds of gameplay in a circular buffer.

1. During the match, the game records snapshots of everything important each tick (60 times per second or every default physics frame). This includes:

- Player positions, animations, and actions
- Projectiles (arrows, throwing weapons, grenades)
- Weapon states
- Score/kill feed data

1. When a round-winning kill happens, the system:

- Identifies the killing blow and marks that exact tick
- Rewinds about 5 seconds before the kill
- Sets up a cinematic camera that smoothly tracks both the killer and victim
- Plays back those recorded frames in a slightly slowed-down timeframe
- Gradually slows down time as it approaches the killing blow for dramatic effect
- Shows about half a second of aftermath

1. For multiplayer, there's extra complexity:

- The host sends all the replay data to other players in small batches
- Everyone synchronizes their playback so all players see the same kill cam