From the current situation, it appears that those four were bitten to death by the flying insects earlier.
If they were accidentally bitten while hiding in the crevice, then why did they hide there? The crevice wouldn't have provided shelter from the flying insects, as the insects were small enough to fly inside.
Unless, they thought hiding there might lead to a way out. Otherwise, they would have been better off running than lying here waiting to die.
Of course, one cannot exclude the possibility that they were surrounded by the flying insects and chose to hide there as a last resort.
But if that was the case, what about the other team members? If they hadn't found a way out, how did they manage to escape in time?
Lin Wu didn't know what had happened at the time, but one thing was certain, there really was a way out.
After she crawled into the crevice and turned around to look at the rock layers.
