From the Officer Down Memorial page:
Read more: http://www.odmp.org/officer/15137-sergeant-billy-coln-crespo#ixzz3xl27IkW6
The shooter exhibits the following body language signs:
Motionless until officer walks in
Gaze aversion from officer
Back contorts on right side
Controlled double take at officer or exit, puts can down
Over exaggerates hand movements
Looks at exit
Over exaggerates hand movements
Touches gun
Over exaggerates hand movement
Looks at officer or exit
Over exaggerates hand movements
Looks at exit
Back re-contorts on right side
Touches gun
Motionless
Looks at exit
Executes “Flight Plan”
Cover officer experiences 4 second perceptual lag.
A longer version of the video is available here:
https://www.youtube.com/watch?v=CrilnBDEOag