Alduin is defeated.
The heroes of Sovngard have retired to their hall to celebrate...they'll have no lack of ale or mead to drink, judging by the massive vats in the hall.
My orc is transported to the throat of the world and uses 'Clear Skies' to better see the dragons circling around the mountain. She approaches grounded dragons, seeking out Paarthurnax: none attack her. Odahviing and the old boy remain on the ground while the others take to the air, wheeling and crying out. Are they mourning? Are they anguished? Are they simply honouring the passing of one who was once great? Who knows? They may even be celebrating his greatness, whilst acknowledging the need for his demise.
Odahviing offers his loyalty despite the maelstrom of emotions that he must be feeling. Paarthurnax is full of melancholy but offers wisdom to the dragonborn, regardless of his grief for his brother.
Yes, melancholy is an easy trap for a Dovah. To be melancholy requires age, wisdom and long understanding: dragons have all of these things in abundance.
My characters have never killed the old dragon and never will. Surely to be dragonborn you must at least empathise with the Dovah. As Arngeir always tells you, to learn the words of a shout means feeling them as a part of you. 'Dragonrend' is paradoxical because to use it, you must understand dragons yet the act of uttering the shout shows that you do not.
My orc stayed with the old dragon for some time, out of respect.
She shared his melancholy.