Fawkes x Fiendfyre Phoenix. Bonus points for QM and AD standing around uncomfort...
This comment was posted to reddit on Mar 25, 2015 at 12:57 pm and was deleted within 4 minutes.
Fawkes x Fiendfyre Phoenix. Bonus points for QM and AD standing around uncomfortably and carefully not watching, since it would be too awkward for either to be the first to say anything or resume their not-the-kind-of-climactic-they-were-expecting final battle.