To support a unified command structure when dismantled, echoing up and down, motor coordination, when untie the knot with another person-related, you should notify the other party, may fall.
When the support structure is removed, the unified command, the up and down echo, the action coordination, when untangling the buckle related to another person, should first notify the other party, in order to prevent the fall.
When the support structure is removed, it shall be under unified command, with up and down response and action coordination. When the knot related to another person is untied, the other party shall be informed first to prevent falling.