So.... Wasn't doing this on purpose... But.. Found a great way to be a giant dick and have some fun with invaders.
In the Undead Settlement, I was invaded by the boss. Seeing that the entrance to the boss was still open (since haven't triggered it yet) I went in to kinda get rid of an invader. It worked, couldn't come after me.
For the 1st guy, I came back out and killed him, without hiding. Funny thing is he tried to escape the world several times. This is without trying to be a dick.
The 2nd guy, I hit behind, and with my +10 Astora Greatsword, I held down the R2 and knocked him back. Did a 2nd one and killed him. That guy I was being a dick to, since I did the R2 behind the fog gate where he couldn't get me or see me.
3rd guy is just roaming around the area, no idea where I am. I used a Tree of the Giant on him. lol
But I am def going to not kill the boss now. This is kinda fun. lol