At about 7:30 A.M, BongmanduRugas was a passenger in the early morning train of MRT Edsa to North Ave.. When the train arrived in Santolan Station, Jing Goy who happened to be a security guard in MRT North Ave station rode the same train that would take him to North Ave station. While inside the train, Jing Goy saw Bongmandu and was reminded of his personal grudge against him. Jing Goy immediately shot Bongmandu using the gun provided by the MRT security office. Bongmandu died hence his heirs filed a case against common carrier for breach of contract of common carriage. Is MRT liable? Decide with legal basis.