I work down that way (he's on Cheapside heading towards Bank junction).
In fairness to those calling him out for being a bad bellwhiff, that would have been shot early on either a Saturday or Sunday morning, because it's much busier Monday to Friday and he wouldn't have been able to do it.
I don't think anybody is particularly endangered by that, save the rollerblader himself and the girl he just about misses when he inadvertently gets spread all over the pavement.
I've seen fixed-gear plaid-cast beardie types do far more anti-social stuff than that on that stretch of highway.