If Alice and Bob are doing something that might be plausibly interpreted as a race, and Alice is not
[doing the things that you’d expect her to do, if she wanted to move faster, if she thought about the situation as a race],
but she is
[doing the things that you’d expect her to do, if she wanted to slow Bob down, if she thought about the situation as a race],
then this should make an impartial observer Charlie increase his credence that at the very least Alice (if not Bob) is thinking about the situation as a race.
If Alice and Bob are doing something that might be plausibly interpreted as a race, and Alice is not
[doing the things that you’d expect her to do, if she wanted to move faster, if she thought about the situation as a race],
but she is
[doing the things that you’d expect her to do, if she wanted to slow Bob down, if she thought about the situation as a race],
then this should make an impartial observer Charlie increase his credence that at the very least Alice (if not Bob) is thinking about the situation as a race.