wheelchair on reels

This morning I was at the hospital and saw something interesting.

There was this man on wheelchair at the waiting area, waiting for his turn to see the doctor. He's in his 30s I guess. He approached the nurse and told her he was going to the toilet, lest he missed the queue number. After that, guess what, he stood up and brisk-walked to the toilet! In the first place, did he need the wheelchair? Or was there no empty seat at the waiting area?

Then I saw a lady on wheelchair, her right leg was amputated. A nurse came, and asked if the lady could stand up. I was like, what the? The nurse didn't realize at first.

Did the nurse ask the first guy the same question? (and the guy must had replied "yeah I can run a full StandChart")