To replicate the 3 shots in 5 to 6 seconds and score 2 hits and 1 the headshot at the longest distance, one merely needs to completely ignore the ACTUAL condition of the ACTUAL rifle used by the gunman (allegedly an MC rifle) and also ignore the ACTUAL condition of the cramped space in the SN, and above all else, not have a 15.5 inch open window space to shoot thru, or a tree in the way part of the time, or any other ACTUAL condition the gunman had, such as NOT being able to work the bolt from 12:25 to 12:30 (otherwise clak clak noise would have been heard by Harold Norman BEFORE the shooting started).
Note also: the scope was malfunctioning, and could not be aligned except by unscrewing the actual mount, place a shim under it, and screw the mount back into place.