The risk of ‘line of fire’ was not considered by the work party, in addition to not having a Lift Plan for suspending the load. The Helper remained in position under the load, holding the Fifth wheel release handle after pulling it. He believed it was safe to remain under the load as it was accepted practise for some personnel to do so. When an unplanned event occurred elsewhere on the Rig move, the dynamic change in planning arrangements did not factor in leaving the work party without a Supervisor (coordination of critical staff). None of the work party intervened or used Stop Work Authority when unsafe practices were observed.