Buddy, I am sorry to say but I don't think you are going to last here at all if you want to shoot people. This is a roleplay server, we talk to people instead of trying to kill them. If you want to initiate on someone, you should point a gun at them and say "Put your hands on your head. If you don't do this, you will be shot." Then, if they don't do that, you can kill them but DO NOT give a countdown!!
Any other question? Please try and roleplay instead of wanting gunfights all the time.
This is a Roleplay server... I think looking at your video and your question here today you need to go and purchase GTA 5 on steam as you have got Altis Life all wrong.
Maybe ramming them with a SUV, hurling abuse at them and then shooting them in the head to then drop their downed body in sea without saying anything before or after you hurl abuse.. I think that would work.