Xism trying to scam me and then threatens to DDOS me

I was trying to sell him cs:go gun skins and added him on skype and just started having a general chat about where we were from etc. On my thread it says i want OCE Riot Points( For LoL) and he assumes im from australia and then i say no im from New Zealand, which is where magically appears to also be from. And i ask where from and throw some fake questions to try see if he legit is from here(NZ FTW). He then gets rather annoyed and wants to proceed with the sale rather then some chat. We then agree on the price of 25NZD in Riot Points and i tell him to go first, and he refuses and starts accusing me of scamming. He then claims to be trusted so i check his vouches and he has 6 which i didnt deem enough to be trusted to give him a 35usd gun skin for upfront.I then ask him to use an OMM and he says no and then he then says bye and threatens to DDOS me.

His Sythe account
http://www.sythe.org/members/403339-xism.html

Thread Sale
http://www.sythe.org/steam-sales/1683206-wts-cs-go-gun-skins-glock-fade-fn-ak47-fire-serpent-ft.html

Skype Log
http://gyazo.com/dc8882842a49092ec2366d41370e8715

Pic of thread with his comment( Just incase he removes it)
http://gyazo.com/0640f2e7386a7052b4784cf71970e194

If more skype log pictures are needed just say i will happily provide them

 

I need proof of the Skype profile

needs to match this - http://puu.sh/707FV/7ffe0edc21.png

 

Three days with no update.