the agents in chicago had to immediately take action, which required them to pursue the vehicle that the shots had come out of. duck could see these cars suddenly come from nowhere, and he put it together right then a there. he knew he was under surveillance, and he suspected other things might be wrong back in rockford. he then placed a call that we intercepted into the dope house in which he warned the individuals there that he thought he was being followed by federal investigators and that they should get out of the house immediately. >> they scrambled back to rockford that night, and duck,