Contractor Starting On "Change Orders" Without Finishing Original

[Wardell Picquet]

I'm using a Hard Money Lender for a Flip. I paid the contractor a portion of the original bid amount to start on work. He has not finished the work he was paid for but has started on "change orders" that I did not authorize or sign. My question is : Can he still file a Mechanic's Lien against me? And what does that entail, exactly?