A glitch occurs where this quest cannot be started if the player has attained but not completed the quest to retrieve the Helm of Winterhold. If you have the quest in your log by the time you finish the previous Companion's quest, it will not be started. To avoid this, do the Jarl's quest without killing the dungeon's boss (or anyone if you want to be safe) before you complete the previous quest. If done correctly, this quest should be started as normal. If you have already completed the previous quest, follow the above instructions then use the console command "player.setstage C05 0". If you completed the Helm of Winterhold quest after completing Blood's Honor, but killed everyone, it may be possible to go back to the Silver Hand hideout and resurrect the boss NPC, and follow the above instructions. The below console command to skip the quest has a high chance of glitching out the next quest as well, so be doubly sure you saved before hand. If nothing else works, the quest can be skipped by using the console command: player.SetStage C06 0. Remember to save first! [verification needed — can someone else trigger/understand this bug - and if yes, shorten the description?]