Even with the presence of the onlookers, the journey to the mana rich forest was quite peaceful. After journeying for about three hours, everyone was finally able to see the dense forest ahead. But before entering the forest, Beel asked all her people to rest up for some time.
Actually, travelling for a few hours was not tiring for anyone of their power level. So they did not really need a rest at this time. But as the forest was dangerous, Beel was giving them this rest to change their mindset and to get ready to be cautious all the time. The mana dense forest was filled with powerful monsters. Entering it without being fully prepared would only lead to death.