If you see him you can do one of three things
1. Alt F4
2. run the ♥♥♥♥ away
3. Accept fate and try to kill the ♥♥♥♥

Assuming you picked the 3rd option I have some advice

You are literally fighting someone with 1000 ping, literally just leave

Still here? Ok.

Shoot him a ♥♥♥♥ ton of times, then die by him, and watch him show up in the killfeed of you killing him 5 seconds later.

There is no winning.
There is no fair fight.
Accept your fate.
And die.