After a battle like the one they just had, the group needed to find somewhere to rest. At the same time, they wanted to be careful not running into any more beasts. In the fight, both Dennis and Nate had used their soul weapons which took a lot of energy and MC cells. They needed time to recover before they could fight again.
In the desert, there were several areas where large rocks would be sticking out of the sand; although most of them were small. Eventually, they managed to find one big enough that allowed them all to fit under, taking cover in the shade.
It wasn't hot like a regular desert back on earth, or on other planets. The planet itself was quite cool, but it was still a nice spot for them to gather their thoughts. While doing so, it felt like Quinn had the eyes of the Parasites on him, but it wasn't only them, as those in his group were staring at him as well.