Why does Hysteria cancel killer instinct?

So I was watching a video of a legion running Hysteria and it activated during frenzy and killer instinct just stopped working why is that?

Comments

  • Legion's Killer Instinct is tied to survivors inside his TR (unless he has the addon to extend the KI range, but no one runs that). When a survivor is oblivious they are unaffected by any effect the killer has that requires them to be inside the TR including being detected by KI.

    There's one exception and it's Doctor's power which specifically states that it ignores obliviousness.

  • Because oblivious = no heartbeat