Though the mother hesitated at first, the cub started running immediately, which forced her to follow it. Though the cub didn't want Ark to get hurt, it didn't even hesitate when he told it what to do, the cub knew that Ark meant well, and had grown to rely on him and his decisions by now. The mother looked worried when she looked back at Ark as they ran, but since she had to protect her cub, there was no way she could stay behind and help him.
Ark was delighted to see them run away when he told them to. Otherwise, this fight would've been a lot harder. Ark didn't plan to defeat this gigantic monster at all, even if he might be able to if he tried his hardest, Ark didn't think that it was worth it to risk his life right now, especially when he had actually found something that he wanted to do. Whether that was just a thing for now, or if it was something that lasted longer, Ark wasn't concerned, for now, he was feeling happy nonetheless.
