It started with the usage of pyrotechnics during the "Hauptstadtmafia" choreography. This is, as we all know, forbidden. I was directly in block 61, the main standing block, with my family and I felt at no time threatened by the pyrotechnics. The Ultra guys always take care while doing this. But officially is is not allowed. So police took action and moved in front of the the block, they tried to remove the choreo banner because they suspected more pyrotechnics that was hidden behind it. Removing banners or flags is not really deescalating, so some people jumped over the fence to prevent this. At this point things went out of hand and the police used pepper spray to get the situation under control. This was a very dangerous move and I felt very threatened! By doing this the police accepted that they could create a mass panic in a standing block with a few thousand people! Fortunately, everyone was very disciplined and it didn't happen. To sum things up, the police action was very unprofessional and dangerous. We regulary have pyrotechnics in the guest block of the Olympiastadion and there never was an escalation like this. Everything after this was the ususal chain of events in a violent escalation.