260 F.3d 54 (1st Cir. 2001) LIBERTY MUTUAL INSURANCE COMPANY, Plaintiff, Appellee,v.METROPOLITAN LIFE INSURANCE COMPANY, Defendant, Appellant. No. 00-2072 United States Court of Appeals For the First Circuit Heard April 6, 2001Decided August 15, 2001Amended August 21, 2001 APPEAL FROM THE UNITED STATES DISTRICT COURT FOR THE DISTRICT OF MASSACHUSETTS [Hon. Robert E. Keeton, U.S. […]