The most important skill a rigger develops is not tied to any specific technique. It is reading.
A bunny in rope cannot always tell you what is happening in their body, partly because the altered state of rope space makes verbal self-reporting unreliable, and partly because some physical issues — nerve compression beginning, circulation being affected — develop gradually below the threshold of conscious awareness. The rigger must read these things before the bunny reports them.
Breath is your most available signal. A bunny breathing slowly and deeply, with the rhythm of each breath moving visibly through the rope, is generally well. Breath that becomes shallow or held, or that quickens without obvious external cause, is information — something is changing. Check the tension of the adjacent tie, check for facial pallor, ask directly and simply.
Muscle tone through the rope. A body that is receiving the rope — that has settled into the tie, that yields to pressure — has a different quality under your hands than a body that is bracing or managing something. Settled muscle is soft, warm, receptive. Bracing muscle is different in a way that you can feel through the rope as clearly as through direct touch. The specific quality of resistance in a wrap that is affecting something tells you before the bunny can tell you.
Color and temperature in the extremities. Hands and feet that are changing color (reddening or going pale) or temperature are telling you about circulation. Check them regularly in any tie that includes the limbs.
The verbal channel remains important. Simple check-ins — not extended conversations but single-word or short confirmations — give you data and maintain the relational thread without breaking the scene's atmosphere. *Still good? Good.* The rhythm of this exchange, brief and consistent, is part of what the bunny experiences as being cared for by the rigger.