Laying the Scent Border is a Complex Obstacle requiring several Tests. First, the Patrol needs to decide how you want to thaw the Scent, which will probably require a Survivalist Test. This can occur in-character or out-of-character as you so choose. It requires a Scientist Test because it has to be cut with water and mixed properly. In addition, laying the Scent requires a Pathfinding Test to make sure it’s poured in the best spots. Finally, with the wolves out there, you may want to assume that any failed Tests will result in an Animal Twist in which the patrol will stumble across the wolf and/or her pups. So talk it out here in- or out-of-character (or both) how you’d like to proceed, and I’ll chime in as needed.