Ian, you believed that your 4 bitcoins were in danger of being lost by being in CPA. You had no access to that money. Nothing has changed other than you are reducing the value that you perceived was at risk. He is giving the money back. This is an interpretation of the contract you signed.
What is the real problem here? The capital you had available to you has not changed, and you have secured what you think of as a better place for your investor's money.
Also, stop making those damn single posts with the smiley under them. They are fucking annoying.