granted, they couldn't reach their full speed under the conditions, but they also weren't wholesale completely debilitated
They don't need to be wholesale completely debilitated. They weren't at full speed, so we can't give a rating off of it. It could be 10% slower, 50% slower, 95% slower, who knows. That's where Unknowns or backup feats need to be used.
And if there's literally no other feats within 5 orders of magnitude (since apparently the only other scalable feat is reacting to bullets), that should have set off alarm bells before ever accepting the feat that it could be an outlier.