A pack of wolves are fleeing from the PCs, who are shooting at them with longbows from an entrenched position. One of the wolves is injured and has abandoned stealth in favor of a more rapid escape: it sprints 200 feet into the forest, drops some stolen food behind an adjacent tree, and drops prone. Hoping to protect their packmate and confident they can each take a single hit, the remaining wolves move so that they all occupy squares intersecting the line of sight from the PCs' entrenchment to the fleeing wolf. These squares, however, are sufficiently foliaged that the stealthily moving wolves can derive concealment from them and continue to make hide checks.
The PCs fail their Perception checks to see the hidden wolves. They fire at the visible wolf. Does the visible wolf have soft cover from the hidden wolves?