Scammer reported me for my report

I reported this guy: http://steamrep.com/profiles/76561198180632018

Today he reported me supposedly I didn't like his price so I avenged him by report: http://forums.steamrep.com/threads/...-counter-strike-global-offensive-items.96279/

After that some guy added me and said that this scammer was asked to convey that if I remove the report - he will remove too. This scam has decided to blackmail me.

I already made screenshot of chat and sent it to both reports.

Any ideas what to do next?