You beat him. Badly.

The moment you felt hands on your back, your combat reflexes kicked in. You twisted in place faster than he could react, turning to see him standing behind you, cock erect and posed to be shoved right into you. In slow motion, he tries to transition the push into a grab, but by then, his opportunity has been lost. You twist around him, tripping one leg under his for good measure, and grab him by the shoulders on his way down. With a lightning fast movement and whir of motors, you raise him onto your own shoulders, and hurl him bodily against the wall he aimed to push you into with a crack. Not finished, you place one of your metal feet on the back of his head while he groans on the floor, holding his face down to the drain for almost ten seconds. The robots don't try to stop you.

You consider killing him right here, but think it might involve an extension of your sentence. Instead, you turn the shower off, take your foot off his now motionless body, and pick up your clothing.

Only when you arrived back in your room, the adrenaline wears off, and you catch your breath. You're lucky this happened before you ran out of power. Though that stunt may have cost you the last of your supply.

The next morning, you woke up feeling lightheaded, with a flickering empty battery symbol in the corner of your vision. You tried to get out of bed, but instead fumbled in your sheets, falling off to the ground with a clang of metal limbs on concrete, and dazing yourself.

You eventually managed to remove yourself from your bedding, and find yourself sat on the side of your bed. You clench and unclench your mechanical hands repeatedly, and find they respond with a similar speed and power to before you had your implants in the first place.

Guess you'll just have to hope the other inmate sharing these cells with you won't try anything like that again. After all, he doesn't know you've been reduced, and you really hurt him bad.