Killing Someone

[Burter Jr]

You'll have to fight them for it. Anyone is subject to join the fight under logical circumstances, unless you use a stasis grenade or teleport the fight away from potential interferences

You can fight anyone to the death, with proper IC reason. Dragonball is an acceptable reason

[Vegeta]

If it makes sense IC, then it's more or less a good reason. Just cuz you don't like them is a stupid reason.

And most likely, 20,000 people will join in the fight or the person you're after will run.

[Burter Jr]

Exactly, which is why it's suicide to do it without a stasis grenade

EDIT: Your character has no actual reason to eradicate an alliance...so no.