At first I looked at her from a distance. She was walking with a heavy limp and rather slowly. My heart started to beat violently.

Then I began to approach her from behind, as naturally as possible. I was quite close to her for about 10-15 seconds. Then I had to withdraw so that I wouldn't make her suspicious of my presence. But during that time I could see that her callipered leg was differently shaped. It was uniform of thickness and great parts of it had a reddish colour. And with each step it became knock-kneed when she laid her weight on it, in spite of the callipers.