The above image was recently shortlisted in the British Photography Awards Documentary category. In the caption, I talk about how I have complex feelings about this image, so much so I almost didn't enter it and thought long and hard before I ever shared it publicly.

One or two people asked me about the full series so I thought it would be good to tell that story and show the full sequence of images.

This was the first image I captured of this moment, the first I noticed something was going on. You can see the striped shirt man being grabbed by a policeman with another group behind him. I don't know what preceeded this shot to make the police officer grab striped shirt man but I assume it is due to the "snatch-squad" barrelling through the crown behind him.

Here he has been pushed forward into the police line by the "snatch-squad" (a group of police carrying a protester) as well as being pulled forward by the policeman who had previously grabbed his arm. He clearly looks off balance here.

Losing his balance, he falls forward into the police line and another photographer. At this point, the police seem more interested in the protesters behind him than what he is doing.

He stumbles backwards and falls to the ground. After lurching forwards, I am not sure what it was that caused him to then fall backwards though he doesn't seem at all steady throughout this incident.

He falls to the ground at the feet of the police line. They immediately all try to grab him whilst protesters do the same. The blonde woman in the black top has been with him throughout and tries to help him to his feet.

As he gets to his feet, he confronts the police for, he believes, pushing him to the ground. This was a particularly tense moment that could have very quickly escalated to either an arrest, physical confrontation or both. It was clear in this moment that something was wrong, his expression is somehow hollow, like he isn't really seeing what is in front of him and certainly isn't fully in control of himself.

Rather than moving forward, he steps back and shouts at the police in frustration and anger. Whilst the chance of a physical confrontation seems to have gone in this moment, the looks of concern on the faces of both the police and his fellow protesters is clear: something is not right.

The police move in to grab him but rather than resist or comply, he stumbles.

As the police attempt to detain him he falls backwards to the ground. Protester around him immediately plead with the police to stop treating this like a potential crime and to get urgent medical help.

For a moment, the police seem confused about what to do: one moment in fight or flight and full of adrenaline; the next having to shift gears and see the former threat as someone in desperate need of help.

Eventually the police do come over to him, though initially they still don't quite realise the gravity of the situation, still attempting to speak with him and detain him despite being on the ground. It is clear from his expression that something is very wrong, that he is not well. The police do eventually realise the shift in the situation and get a medic over before taking him and the blonde woman behind the police line for treatment. This was the final image I took of him when I also realised the nature of the situation had changed. My focus shifted to documenting the police reaction and the crowd rather than the man in the striped shirt.

The final image in the sequence is the protesters confronting the police officers involved. They accused the police directly of having pushed over the man in the striped shirt and escalated the incident rather than trying to calm the situation.

Throughout the day there had been numerous complaints about the level of aggression the police were displaying as they carried protesters out of the crowd. I was personally pushed over by a policeman as I photographed them carrying one protester despite being well clear of the group. I fell into another police officer who very nearly arrested me for assaulting her but let me go when I showed my press card and explained what had happened.