Grog followed Scanlan when he decided to go help Vex in place of leaving for Whitestone with Arnicor along with the cleric, they usually met up with Vex'ahlia, Keyleth, and Tiberius within the docks. There, Scanlan pointed into the Mockingbird, and so they all witnessed an explosion as Vax'ildan jumped away from a gap while in the side of your ship