The Commission has analyzed Oswald’s movements between the time of the assassination and the shooting of Patrolman Tippit to determine whether there is any evidence that Oswald had assistance in his flight from the building. Oswald’s activities during this period have been traced through the testimony of seven witnesses and discussed in detail in chapter IV.[C6-80] (See Commission Exhibit No. 1119-A, p. 158 and Commission Exhibit No. 1118, p. 150.) Patrolman M. L. Baker and Depository superintendent Roy Truly saw him within 2 minutes of the assassination on the second floor of the building. Mrs. R. A. Reid saw him less than 1 minute later walking through the second-floor offices toward the front of the building. A busdriver, Cecil J. McWatters, and Oswald’s former landlady, Mrs. Mary Bledsoe, saw him board a bus at approximately 12:40 p.m., and get off about 4 minutes later. A cabdriver, William W. Whaley, drove Oswald from a cabstand located a few blocks from where Oswald left the bus to a point in Oak Cliff about four blocks from his roominghouse; and Earlene Roberts, the housekeeper at Oswald’s roominghouse, saw him enter the roominghouse at about 1 p.m. and leave a few minutes later. When seen by these seven witnesses Oswald was always alone. Particular attention has been directed to Oswald’s departure from the Depository Building in order to determine whether he could have left the building within approximately 3 minutes of the assassination without assistance. As discussed more fully in chapter IV, the building was probably first sealed off no earlier than 12:37 by Inspector Herbert Sawyer.[C6-81] The shortest estimate of the time taken to seal off the building comes from Police Officer W. E. Barnett, one of the officers assigned to the corner of Elm and Houston Streets for the Presidential motorcade, who estimated that approximately 3 minutes elapsed between the time he heard the last of the shots and the time he started guarding the front door.[C6-82] According to Barnett, “there were people going in and out” during this period.[C6-83] The evidence discussed in chapter IV shows that 3 minutes would have been sufficient time for Oswald to have descended from the sixth floor and left the building without assistance.[C6-84] One witness, James R. Worrell, Jr., claims to have seen a man running from the rear of the building shortly after the assassination, but in testimony before the Commission he stated that he could not see his face.[C6-85] Two other witnesses who watched the rear of the building during the first 5 minutes after the shooting saw no one leave.[C6-86] The claim of Deputy Sheriff Roger Craig that he saw Oswald leave the Depository Building approximately 15 minutes after the assassination has been discussed in chapter IV.[C6-87] Although Craig may have seen someone enter a station wagon 15 minutes after the assassination, the person he saw was not Lee Harvey Oswald, who was far removed from the building at that time.