Location: Middle of Mid Lane
Just after the battle, Dampeer is running away with only a few seconds left on 'The Undying', while also under the 'Unbreakable buff', which I have so far seen as healing through the effect of 'The Undying' when one reaches critical health. However, when Dampeer deactivites his insanitarius (Still with 5 seconds on unbreakable), he instantly dies without the Unbreakable buff triggering.
Edit: After playing around with it, it looks like you don't even need to deactive the insanitarius. If you have insanitarius and The Undying on, Unbreakable will not trigger at all