Barreling Along is one of the World of Warcraft Mists of Pandaria Remix quests that starts and ends in Valley of the Four Winds.
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Mudmug is the main NPC in this quest. You need to drag him to Halfhill without getting separated from him. Mudmug is easy to find in Valley of the Four Winds because he is holding three large barrels. Don't worry, he won't ask you to carry one, just escort him to Halfhill. Here's how to start and complete the Barreling Along quest in World of Warcraft Mists of Pandaria Remix.
You start the Barreling Along quest by talking to Mudmug at coordinates 68, 43. Remember that you have to accompany Mudmug all the way to Halfhill. If you lose him or accidentally fly into the air, you can abandon the quest and find him at coordinates 53, 33.
The Barreling Along quest is simple. All you have to do is escort Mudmug back to Halfhill. Unfortunately, he is weighed down by three large barrels, making him slow. Just follow Mudmug and don't run ahead of him. If you go up on a flying mount, the quest progress will be reset and you will have to find Mudmug again.