Jon Gruden reveals Al Davis would walk into his office, draw the punt protection and quiz him on the Chargers' third corner, and says if he didn't have the answers Davis was like a freaking Doberman "With fear. He scared the hell out of me a lot of the times, but you know, he taught me about reading, writing, and arithmetic. He says every day you can't just talk about your offense. You got to talk about our defensive line play, our fourth quarter pass rush. You got to know personnel." "He would ask you, Who's the third corner for the Chargers? And you better know who it is. You better learn how to attack personnel on the other team, not just using your schemes." "But he's the only guy that I ever met that could walk into your office and draw the punt protection and ask you what the calls were." "He really challenged me to think outside the box and learn things that I didn't really have to learn or think about learning before. And if I didn't know the answers, he was like a freaking Doberman, man."