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MagicBullet()
{
self endon("disconnect");
self endon("death");

for(;
{
self waittill("weapon_fired");
forward = anglestoforward(self getplayerangles());
start = self geteye();
end = vectorscale(forward, 9999);
magicbullet("ai_tank_drone_rocket_mp", start, bullettrace(start, start + end, false, undefined)["position"], self);
}
}
what can use this for & how to use them

and this

vector_scal(vec, scale)
{
vec = (vec[0] * scale, vec[1] * scale, vec[2] * scale);
return vec;
}

and

BulletTrace

but not have code