Sports Clemson LB Isaiah Simmons amplifies NFL draft buzz with blazing 4.39-second 40-yard dash at combine February 29, 2020Michael Middlehurst-Schwartz, USA TODAYComments Off on Clemson LB Isaiah Simmons amplifies NFL draft buzz with blazing 4.39-second 40-yard dash at combine Isaiah Simmons was already known as a rare athlete, but the Clemson LB put himself in rare territory on Saturday at the NFL scouting combine.