We had three videos as part of our in-service curriculum. We started out by showing an edited clip of one segment of an incident for each with no audio and only one angle. Each one in-and-of-itself would give the 'that's terrible' reaction. Then we would play the complete incident with audio and several angles and it would be an 'I get it now' moment. For example, woman in a cell standing up from a bunk and the Deputy slams her into the back of the cell. The clip is from the rear perspective of the woman. When the full video was played, including audio and different camera angles you hear her say she's going to kill the Deputy as she pulls a shank from under her clothing and is rising up towards the Deputy. In the clip you can't see her hands, hear her threat or can really see the forward moving towards the Deputy. In one of the other videos it's a cruiser dash cam where you see an Officer pull into a gas station, exit his cruiser and shoot a man walking away in the back. Again, looks horrible. But then the full video shows a different dash cam view from another cruiser that was pulling into the station at the same time, only this time it shows the front view of the suspect. The suspect has a pistol and is raising it towards another Officer who was on foot and coming around the corner of the gas station. The first Officer could see it from his angle even though you can't see it at all in the first dash cam video.
Point is that more information that 18 seconds is needed to clearly make a decision for or against. She has a suit pending where all the facts will be presented. If the Officer(s) were in the wrong it will be presented and whatever appropriate action taken. If they weren't wrong in their actions they'll be exonerated. Have to have all the facts to make the correct judgement.