Grog adopted Scanlan when he decided to go aid Vex instead of leaving for Whitestone with Arnicor and the cleric, and so they fulfilled up with Vex'ahlia, Keyleth, and Tiberius within the docks. There, Scanlan pointed towards the Mockingbird, plus they all witnessed an explosion as Vax'ildan jumped away from a gap during the side of your ship, wher