On 2nd of Aug, a Thermal QUANTUM Packer assembly was picked up by a crane with two web slings and moved to the rig floor. The 3 ½” hoist elevator was latched on to the handling sub of the assembly and continued to pick it up, while the crane continued to lower the assembly to the hoist floor. When the assembly was fully vertical and about 30cm from the hoist floor, the QUANTUM Packer assembly de-coupled from the service tool. The driller continued to pick up the service tool 1.2m till it was out of the QUANTUM Packer assembly , and the assembly dropped on the hoist floor causing First Aid for two IP’s. Operation was suspended and the situation was assessed.