Ash knew it was time to go and he immediately tried to calm her when he felt her tense, "Come on. Keep a cool head and stay with me. We'll find Bella and get you out of here." And he needed to get to his parents. Let it not be said that Ash was going to let a girl fall victim to the Death Eaters. He could be callous at times, and an asshole, but he wasn't heartless.
He immediately stood up, seizing hold of her hand and then starting back around the tent where she'd emerged from. Ash would get to his parents eventually, if they hadn't left yet or were already looking for him. They would look for him though. He was their son and their heir.