Some hand timers had Byrd running as fast as a 4.35 in the 40 .
Demetrius Byrd ran the fastest 40 - yard dash time with a 4.43 clocking on the automatic clock .
Some hand timers had Demetrius Byrd running as fast as a 4.35 in the 40 .
Demetrius Byrd ran the fastest 40 - yard dash time with a 4.43 clocking on the automatic clock .