Jimmy and Zik approached the four kids that survived the large boulder. Zik joined because he was the only one who cared enough about these kids to save them.
The two of them put masks on, as to seem familiar to the kids. This way, they believed that they could approach the kids without spooking them off, or worse, without triggering their senses in such a way where they become defensive, and try to stab the life out of the two of them.
It was smart to do so, because as soon as they approached the kids, they saw them crying over the flattened bodies of their parents. If they saw unfamiliar faces, there was a chance that they'd react violently.
This place was a blood bath. The flattened bodies were barely recognizable, and the scene was so gross, so gut wrenching, that Jimmy started puking seconds later.
