I logged into my account on his TeamViewer and then got logged out of my RuneScape account. Fortunately, I was logged into my account on the RuneScape account management website. After changing my password and logging back into the game, both my bank and inventory were completely changed and I could tell he was in the process of transferring my items over to his account, see here: http://img4.imageshack.us/img4/8969/110405184419.png