Once you have completed Against the Charr, Pyre Fierceshot will appear any time you enter Grothmar Wardowns. From there, head Northeast into Dalada Uplands. Follow the quest marker a short distance to a small group of Charr outside of what looks to be a zone portal (but which is inactive). Once you defeat the small group you may then click on the Charr Lock to enter the town and kill the Charr inside. When Scorch Maulclaw is defeated you will immediately (no chance for skill capture) be taken to a cutscene. You will then be placed in the town of Doomlore Shrine.