Roy Gilbert was a expert witness in a toxic tort lawsuit. When Gilbert sent his final bill to attorneys Akins & Pettiette, they did not pay, so Gilberts lawyer sent letter demanding $5448.25. Gilbert received check for the $5448.25 that stated Endorsement of this check constitutes indemnity of any claims and/or causes of action that arise or may arise out of the toxic tort case and the present case. Gilbert rejected check. The lawyers claimed he breached contract to settle for $5448.25, did he?