Pulley forces on the moving block must sum to zero. In addition the tension in the rope must be the same for each of its parts. This means that the two parts of the rope supporting the moving block must each support half the load. These are different types of pulley systems: The mechanical advantage of the gun tackle can be increased by interchanging the fixed and moving blocks so the rope is attached to the moving block and the rope is pulled in the direction of the lifted load. In this case the block and tackle is said to be
Hook (Once Upon a Time) memories. Upon recalling what Emma did to him, Hook immediately renews his plot to revive every Dark One and kill Rumplestiltskin. However, after a confrontation with Emma and Regina, Hook has a crisis of conscience and turns on the Dark Ones. Subsequently, Hook sacrifices his life to destroy the Darkness once and for all. However, upon the discovery that Gold has betrayed Hook to take back his power, Emma blackmails him into helping her get into the Underworld, so that she may launch a mission to revive him. In the Underworld, Hook is tortured by Hades. However, with the help