Quest bug DK

[remamakiller]

ExO can't explain myself well, but check out the quests:
https://www.wowhead.com/quest=12680/grand-theft-palomino and

Into the Realm of Shadows

Salanar the Horseman at Death's Breach has challenged you to slay the Dark Rider of Acherus and take his Acherus Deathcharger.Should you succeed, return the Acherus Deathcharger to Death's Breach and use the Horseman's Call to summon Salanar.

www.wowhead.com

Both disconnect you when you complete them