I would say the coldness of the officer was proof he had been over come by the situation. Adrenaline dump had turned his reasonable thinking off. Its of utmost importance for the other officers to see this and react.
1) Reynolds, If I'm not mistaken - you have a LEO background
2) Suppose the LEO in questions had a valid reason to "knee" the ultimate victim,
-how long would have been a acceptable to keep his knee on the victim?
3) lets suppose the evidence shows, the office was not guilty - but would the
jury be afraid of issuing such a decision - knowing that the rioting would start all over?
DISCLAIMER _ This post is not to be construed that I think the former officer is innocent.
Rather, I just like to see all points all view before making a judgement.
One other thing - of all the people who have have basically presumed judgment on this story -
I wonder how many often say "I don't judge people"