For LSU safety Grant Delpit, the three scariest letters are R-P-O. The latest offensive craze in college football, the run-pass option, is a pain in the you-know-what. “It’s something you hate when you’re a DB,” LSU’s starting safety says. “It’s hard, bruh.” In a sit-down with Sports Illustrated, Delpit takes us inside his head while playing against an RPO scheme, like the one the third-ranked Tigers (7–1) will see Saturday night in their epic tilt with top-ranked Alabama (8–0). Delpit calls the RPO one of the most difficult concepts for a defense to defend, and if you don’t know why, you’re about to find out.