First instance of killaura is a few seconds after I begin the clip. He instantly snaps to me despite being behind him and attacks me.
Second instance is at 0:17. He begins fighting Tankerlaner and is kicked for presumably hacked clients.
It's important to remember that certain clients allow you to change your killaura's FOV by whatever you want. This is why in the first clip he hit me when I was behind him, and in the second he did not.