Miff,
Is this the sentence that bothers you most?
\"They [meaning the three-year-olds] were able to run a really fast time because they were attending a really fast pace.\"
If so, I think the problem might be how we define his use of \"fast.\"
Does he mean \"fast pace\" relative to all paces/races?
Or does he mean \"fast pace\" relative to the ability of the horses in the race?
If he means it the first way, then a top horse can run at a pace that would be really fast for the average horse but is quite tame for a horse of his ability, and he can use this pace as a springboard to a fast final time.
If he means it the second way, then he is out of his mind.