I was at the King Alfred when it first kicked off with the idiot skate. Started sining PUP thinking no one would react. When two people jumped over the wall about 40 followed and he got a bit of a beating by the looks of things. 'twas an idiot though, deserved it.
The congregation by the footbridge (as seen in the youtube video) was a result of people who had ran from the Alfred towards the bloke. Just a load of goading when the skates went past, few coins thrown. One Saints fan got his leg chewed quite badly by a police dog.
At the Freeborn garage it did get a bit lairy and I thought Saints fans were going to break through the fence at one points but the batons came out. After allsorts of objects were thrown (rocks, planks of wood, metal signs.....mainly from Saints fans) the police horses swiftly got rid of everyone in the garage car park.
http://www.youtube.com/watch?v=Vo_x405qC8g