which safety guideline for using bows is unique to the crossbow?

The safety guideline for using bows that is unique to the crossbow is:

Keep your fingers, thumbs, and hands completely out of the string’s travel path and below the flight deck/rail whenever the crossbow is cocked or being fired.

Why this is unique to crossbows

• A crossbow’s string travels very close to the rail and over the foregrip, so any finger or thumb slightly above the rail can be struck with extreme force, often causing serious lacerations or even partial amputation.

• Traditional vertical bows also require keeping hands clear, but the specific risk of resting fingers or thumbs on or above the rail/forearm—right in the exact string path—is a distinct crossbow hazard emphasized in crossbow safety rules and training materials.

Related crossbow-only style rules

These are often taught together with the “keep hands out of the string path” rule as crossbow-specific practices:

• Treat a cocked crossbow like a loaded firearm, including using a mechanical safety and trigger discipline, because of its rifle‑like stock and trigger mechanism.

• Avoid dry‑firing a crossbow (pulling the trigger with no bolt loaded), which can shatter limbs and send fragments forward even without an arrow.

TL;DR: The standout, unique safety guideline is to keep all fingers and thumbs below the rail and out of the string’s travel path on a crossbow, due to the way a crossbow’s string moves along the stock.

Information gathered from public forums or data available on the internet and portrayed here.