Alaric was giving this next fight his all. He had sent Ethan and Sarah away to grab Barry, and then get a few days head start to grab the behemoth level ship with the mato cannon on it.
Once they steal the ship, they're supposed to meet Alaric, Heros, and Eli with an army of rebels in the south of Ranid. They need to attack together because Stonelich and Ashchild are most likely going to be together.
Alaric left a few days after Ethan and Sarah left; he needed to talk to the rebels and explain the situation. So he, Heros, and Eli left the people in Weton while journeying to Ranid.