You know I have no idea. Even if Ridahne sees the band on Darin's leg there's no way of knowing what's in it. The Gardener does have some powers, but they aren't physical. Darin's already got them, sort of. They are vague "know the hearts of men" type powers. It's why she's trusting Ridahne as much as she is. It's how she knew the bandits weren't planing on anything nice. It was how The Gardener knew Darin was next. Darin attributes them to instincts or gut feelings. If there's a way to use that that would be awesome.