Discharge of surety: creditor conduct impairing the surety's remedy relieves surety from liability under guarantee law, with examples. A surety is discharged if the creditor does any act inconsistent with the surety's rights, or omits a duty to the surety, and thereby impairs the surety's eventual remedy against the principal debtor; examples include creditor prepayment that defeats subrogation, negligent sale of security reducing recovery, and omission of agreed supervisory duties enabling loss.