It's about 10kɃ, which is a significant sum. For all I know Vandroiy is in a tent in the rain somewhere. Personally I'd wait until I was back at home as well.
I would have provided a payment address at the time of the bet, and had it written into the contract. For 10k BTC it's worth someone hacking the forum software to be able to send a PM as Vandroiy but giving their own deposit address.
I don't mind if someone wants to send me 10k BTC while I'm in a tent in the rain. It will be perfectly secure until I get back to civilisation (he writes, from his cabin in the rain in the middle of nowhere...)