The only disability in life is having a bad attitude
You don't call the witness a liar, not while he is in the witness box.
If the legs did provide such an advantage that some of the people are claiming they did, then there would be a lot more amputees using the exact same prosthetic legs I have, running the exact same times I have - and that's not the case.
I've been followed home late at night. I've been shot at on the highway.
I have run two Olympic 'A' standard times over the past 12 months and with the time I ran at the African Championships last week I know my speed and fitness are constantly improving so that I will peak in time for the Olympics.