SHUNT safety

Could you please clarify these statements Change the technique: For example, independent movement of the Petzl Shunt and the descending device. It does not exclude the issue of releasing the cord while manipulating the Petzl Shunt. If the Petzl Shunt is used with a lanyard, then this use falls outside the manufacturer’s instructions. 1. If the Shunt in the situation described is not on a Lanyard (cowstail) how is it attached? and how does that align with the suggestion by IRATA that: "For 2 person rescue training if the Shunt is to be used it must be attached to a flexible device lanyard (dynamic cowstail) of no longer than 60cm (including connectors) if attached from the waist D ring or 40cm (including connectors) if attached to the sternal or chest attachment point. The Shunt must not be positioned lower than the top of the descending device during a two person rescue." 2. I fail to see how an operator descending on a RIG (for example) managing the SHUNT cord and the RIG handle that controls their descent with the same hand could possibly grip the cord hard enough to prevent it functioning in the event of a problem with the RIG or mainline that could cause it's engagement. Maybe I am wrong?

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