Sgt_Kickaxe - 4:45 am on Dec 15, 2012 (gmt 0)
If it was me I'd have left the three sentences, and the rest of the members contributions, on the page and done nothing. The person wanting them removed obviously didn't contact you first and so would lose a legal case based on that and on the quote nature of the infringement. People are allowed to talk about what other people say.
As for Google, I'm 99.9% sure they would have denied the request to remove the page from serps. Why? Because Google borrows three sentences from every stinking page on the internet for descriptions and wouldn't want to open that legal can of worms.
I've had a DMCA based google removal request for an entire article with hotlinked image denied before, the reason being the site using my content was a news aggregation and sharing service.