OK, maybe I'm stupid, but I don't understand this part?

I got my gun and moved towards the bathroom. I screamed at the intruder because I did not have my legs on I felt vulnerable. I fired shots through the bathroom door and told Reeva to call police.

I walked back to the bed and realised Reeva was not in bed. Its then it dawned on me it could be her in there.

I rushed back into the bedroom and opened the sliding door onto the balcony and screamed for help.

I put on my prosthetic legs, ran back to the bathroom and tried to kick open the toilet door.

How was he moving and rushing and walking without his legs on? Does he have other mobility?