When the armies saw the general being eaten as nothing more than a snack, they understood that they were most likely the main dish.
This realization kick started their human instincts allowing them to quickly begin their escape. They could clearly see that this beast was beyond their power. Even the general, whose power was so heavenly was eaten just like that. The man had even used a heavenly flame but the result had remained unchanged. Even the heavenly flame was devoured by the beast before them.,
Bai Wan looked around to see where he was and he felt great joy to see that he had made it to the upper realms.