Seven days passed after Athena's and Miles' deaths. The hunting party members buried the two of them near each other, erected a simple wood and did some simple markings.
In those seven days, they did nothing but gather more information and scout what's ahead of them. They didn't dare to simply move forward.
What if they encountered the same type of Apokalip again? They didn't dare to gamble after the reality slapped them. The resolve they thought about how prepared they were to die collapsed. Just the awareness that they could be next or they could've been the one who died filled them with fear and unimaginable dread.
No one is prepared to die when they still have a lot of years ahead of them. Except for Caleb, who didn't fear death. Of course, if he died, he would lose a lot of benefits. Such as the power system, knowledge, and so on...