俱舍論記 7.35

7.35

「意是依所顯至等無間緣」者，釋。意是依所顯，非作用所顯，故最後心得名為意。等無間緣作用所顯，若法至生相，此緣取為果已定，無諸法及諸有情能為障礙，令彼生相法不入至現。由無餘心續故，所以最後心非等無間緣。

"Manas is manifested by being a support ... immediately antecedent condition" explains this. Manas is manifested as a support (āśraya), not manifested by functional activity; therefore, the final mind can still be called manas. The immediately antecedent condition is manifested by functional activity: when a dharma reaches the state of arising, once this condition has grasped it as its result, no dharma and no sentient being can obstruct it from entering the present from the state of arising. Because there is no further mind to continue it, the final mind is not an immediately antecedent condition.