Eagles rookie Fletcher Cox had a 'Welcome to the NFL' moment on Saturday during the team's rookie camp. Juan Castillo screamed a play dead, strutted to the line of scrimmage, and unleashed a profanity-filled tirade on the first-round pick. "I don't know what I did," Cox said. "But I said, 'Yes, sir,' gave him no lip back, and I just kept going." Castillo, the second-year defensive coordinator, undressed the rookie in the afternoon session when it appeared as if he thought the 21-year old was loafing.