A few facts for you: Arizona rookie receiver Andy Isabella ran a 40-yard dash at the NFL Draft Combine and Cardinals quarterback Kyler Murray did not.

Murray, however, is regarded as a very fast football player, and his tape from last season at Oklahoma would support that. But just how fast? We don’t know.

A good way to judge would be for Murray to race Isabella, who clocked in with a 4.31-second 40-yard dash at the combine. The two rookies did just that Tuesday, and Murray made sure to document the results to his Instagram story.

It would appear that Murray and Isabella were neck-and-neck and ahead of the rest of the pack, but it’s hard to tell who won by the hair of their chin.

If we want to play with the always-dangerous transitive property, we can say this much: If Murray beat Isabella in a race, and Isabella once beat current Cleveland Browns cornerback Denzel Ward in a high school track meet, then Murray should be able to beat Ward.

And if that’s the case, that means the quarterback man just might be the fastest player on the field at some points this season, which is quite the scary thing for opposing defenses to think about.