In a hybrid agreement for a lawsuit, with a flat fee retainer and an additional contingency fee if case is successful, would an attorney put the retainer flat fee I give him, in a client trust account and he would withdraw it as earned or would he put the fee in his own account? Would any unused portion be returned to me at the end of the case? Is there a certain language that I should make sure is in the retainer to make sure it will be refundable? I appreciate any help and feedback. Thank you very much.