[The Red Zone]

Could it be two people. One rager, and one shooter.

[Catspaw]

If he (or she) has a partner, one is the rager, the very dominant personality, and the other is the recipient of the rage, very submissive. It could be the rager that's doing the killing, or it could be the rager directing the recipient to shoot, but I don't know if the rager would allow anyone else to have control over who gives life and who gives death. It's more likely that the recipient is the one who drives, cleans the gun, procures the bullets, even scopes out the sites and reports back.