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Do you not just lock on them (left trigger) and then power-boost at them to knock them over?
If not, you'll have to remind me who exactly they are. I've been doing the Street Challenges and the Time Trials so much that I've forgotten about that bit.
Ignore completely the ghostly-looking geezers on the ground level, and grind and jump all the way to the top.
There you'll find the boss.
Don't knock him over, just jump at him and spray his head.
You'll get damaged but just keep spraying his head.
If you take too much damage you'll have to go back down to the ground level for a health can.
It's quite easy really.
There's a guy in Chou Street who hangs off buildings and fires a long tentical thingy at you.
You have to grind along this tentical and barge him to knock him to the ground, then you can spray him.
It takes a few goes to finally finish him off.
:-D
This is quite tricky at first, but once you've discovered the route it's straight forward.
There you'll find the boss.
Don't bother trying to knock him over, just jump at him and spray his head.
You'll get damaged but just keep spraying his head.
If you take too much damage you'll have to go back down to the ground level for a health can.
It's quite easy really.
When he's gone, the story mode is finished.