Of course with anything preventative what could happen is factored in, it is unwise not to, but for the purposes of the world is watching, thought should be what is the world seeing and with that we have the incident brought up for debate through the fact that the incident involved a cyclist of which the majority of us here are.
Now the person concerned, he might have been cocky, he might have just wanted to cycle alongside the procession, who knows, has anyone asked him or is it assumed he was being an ass hole just because of what happened as there are always many sides to a story and nothing can be conclusive until all sides have been considered.
Now myself in the security person's position, I would like to have thought I would have stopped the cyclist, just grabbed the bike and physically stopped it which would mean I am no longer running at the head of the procession in the glare of the camera, but I am dealing with a situation, a stopped bike the rider is no longer a problem and they can be told civilly to behave or don't do what they were doing for a reason he might not have been aware of previously But dragging someone in front of moving vehicles where they were not before seems to me like endangerment of not only the rider, but myself as that same procession of vehicles might not be quick enough to stop for anyone.
And we all know how unfriendly bikes can be when we fall off them let alone be dragged off them and the rider was dragged along with his bike, I bet he got a nice shin skinning and gravel rash, but a rider riding off after such an incident, has anyone considered shock ?