And snaring them is just part of the problem. Holding them can be even more difficult. Ordinary chains and manacles are not always effective. Nor are cages and cells. The beasts can be slippery. For one thing, they’re not limited by metahumanal preconceptions about how the world should work, and therefore how it "must" work. They’re quick to make use of an opportunity a metahuman might not notice. The classic story of the beast that gnaws through its own leg to escape a trap is just the beginning, as far as Weres are concerned.