I urge you all to look at the video closely.
When the Mounties arrived and confronted Mr.Dziekanski, he seemed to comply, and most importantly, his hands are empty. He moved over as directed, further inside the containment area. Mr.Dziekanski turned towards the glass. Then, he suddenly turned around which caused the officers in view of the camera to quickly jump back and take a more defensive posture. He is almost immediately hit with the taser from his left side. Have a look at Mr.Dziekanski's right hand. You will see that he had grabbed something. You can't really tell what it is, but there are no doubts that whatever it was, wasn't in his hand 5sec before!

What took place after Mr.Dziekanski was secured is of more concern to me!