When Heartfire Hero is exiled from the graveyard and hand with Deadly Cover up, it deals damage to the caster of deadly cover-up:

1. Opponent has Heartfire Hero on battlefield
2. I cast deadly cover-up and collect evidence
3. I name Heartfire Hero to exile & exile one from graveyard, one from Hand, one from deck, and one from the battlefield.
4. The Heartfire Heroes that are exiled all deal damage to me as they are exiled, even the ones in graveyard & hand, as if they died.

Not sure if I am missing something here, but felt like a glitch.