Infinite Health Nihilis? Bug, hacks, or something else?

If you run Talzin lead NS against Traya teams, the trick when only Nihilus is left is to use your specials to stack plague on Nihilus, only use basic if you have nothing else. If you have either Spirit or Daka left, he won't take a turn other than suffering plague damage due to stuns. You still might need 30-60 seconds, but it's a lot faster than spamming basics hoping for lucky hits to overcome his health and healing.