so basically you as soon the wanted target is out and the shock field is unleashed shoot the vents on the cryo pod , after they are destroyed they drop orbs that you throw onto the (wanted) enemy. At some point i think after 2-3 direct hits he freezes on the spot and you transmat him whislt waves of enemys spawn and bosses arrive to be killed :) ! enjoy lads. Video is uploading at the moment EDIT: link added