He's just trying to confuse everyone so he can blame other people. It's simple.
You have his real information. Don't do anything stupid. Just find someone from Prague and tell him to get the police at his home.
I saw some pictures, showing that guy being in a hotel room, taking selfies.. adsasdsad. Also, in that club, images showing alcohol bottles.
Show those images to the police.
1) Get someone from Prague to go at his home. WITH POLICE.
2) Collect as much information you can. Including all nicknames involved in this drama topic. Give it to police. If they don't understand bitcoin, give them the exact amount in USD and tell them if they don't do anything, Interpol will.
3) Next time, DYOFR on ICOs, ITOs, PITOS or whathefuckITOS.
Have fun.