I am the member of staff who issued the ban. Your own clip literally shows the whole situation, two dudes were fighting outside of Little Israel and you were basically inserting yourself into a situation that didn't concern you as none of the guys had dealt damage to you, and then as the guy is walking off he tells you to keep your mouth shut and then you pull out your gun and fire at him and then kill him. This is you failing to follow the escalation rules as the guy was an idle threat, not an active threat. I took the reporting player's ticket and he showed me a clip and then after checking logs, you had left a minute later after killing the guy and so you were banned.
"In regards to how a user is allowed to react to verbal threats.
There are two types of threats, an 'Active Threat' and a 'Idle threat'. Users may kill for an active threat but they may not kill for an idle threat.
The difference between the two is situational but will always pertain to if the person making the threats has a weapon in their hand.
For example, someone pointing a gun at you and threatening to kill you. This is an Active threat.
Someone saying they will kill/beat you in an argument or conversation. (Unarmed, weapon on safety etc) that is an idle threat.
You are allowed to react to an Active threat in that moment (Not later when the situation is over)."