Basically, lemdmehats agreed to transfer gold from Account B to Account A. I gave him details of both accounts, and he agreed not to change them. I logged into Runescape main page about 10 minutes later to find both accounts' passwords changed. They were recovered before any real damage was done (looks like he PKed or something on the main and lost about 10m, but oh well).
Proof of scam:



Proof it's him:

Proof of scam:



Proof it's him:
















