According to the facts so far presented - by the audio transcriptions - the whole incident took less than 90 seconds.
According to the facts so far presented by the hospital report - the officer had injuries to his head - allegedly from an assault/engagement with the suspect/assailant.
Again - the incident took less than 90 seconds.
According to the facts so far presented - the suspect/assailant had an accomplice who provided much of the initial testimony to the news/law/legal teams.
In summary - if taking all these facts into account - the incident happened very quickly, there were two suspects the officer was trying to contain, a physical altercation results in injuries to the head of the officer. The issue of proclaiming the suspects as unarmed came afterward - at this point there is no proof or facts that have been offered wherein the officer had knowledge that his assailant was unarmed.
It could very well be that the officer fearing for his own life after the assault, believed the suspects to be armed and a danger to the public.
We have heard little since the beginning from the other suspect who is still alive, so we have to remember that one officer in the midst of a 90 second assault with one suspect, may have felt vulnerable to an assault with or without a weapon from the other suspect.
These are things the Grand Jury will have heard - I'm sure we will know soon whether or not this becomes a public court case. sw