I bound up two apprentices and a zombie. After a bit, the option to able to capture (I forget the actual word) the apprentices showed up on the menu, but the zombie I never could do anything but attack or tie up more. All 3 were 'pass through'. FWIW, the two apprentices where lying on their sides, but all three were unable to move. The zombie was down to 7 health. I thought 'unarmed' would allow me to tickle them, play with them or otherwise seduce them, but that's not an option.