HWO rig up was in progress at well MAS-01 around 0500hrs crew picked up the stripping stack with the 130T crane and lifted the stripping stack on top of BOP#3. Day shift crew completed safety meetings and handover and jack operator identified that BOP#3 was only supported by a wooden plate, Stop Work Authority was used but not communicated with the supervisor, crew decided to move the BOP on to the correct BOP stand. While preparing the BOP to be repositioned It was found that the torque wrench was stuck on one of the nuts under the BOP. Lead hand went under to free the torque wrench and at that time the wooden plate broke causing the load weight to settle in the crane. Lead hand hit his hand on the XT while evacuating the area, Medic checked and found ok. Halliburton Crew Stopped the operation and informed PDO DSV.