Here's where it gets tricky. You have to call Ticketmaster to change the ownership with your ID and credit card. This is almost impossible to prove online unless you know the other party extremely well. Like how is Sergei in Russia supposed to know if I actually transferred the ticket ownership to him after he pays me.
Only the USA gets physical tickets. International buyers have to pick them up at Key Arena with government ID and credit card.
He can resell it, but I don't know what way would be best. When I had to sell my TI3 ticket on Ebay, the first seller fell though, and the second tried to scam me out of it and almost got away with it. The person ether stole an ebay/paypal account, or falsely claimed his account to be compromised. In the end, I was able to get Paypal to cover me with Seller Protection, because I had activated the ticket and didn't just trade the Steam Item, and was able to actually mail a copy of the ticket along with just emailing a link to it.
Thanks guys. This is valuable information. I'll let him know