注大乘入楞伽經 5.247

5.247

明不覺五陰諸法自共相是自心妄現不實故，妄計有八識身，即有妄想覺知種種境界，覺境界者名為佛也，依之起染故復名血。以空無相願三無漏智，斷彼八識妄覺染污，名為惡心出佛身血也。

This clarifies that because of failing to awaken to the fact that the specific and common characteristics of the five aggregates and all dharmas are unreal false manifestations of one's own mind, one falsely posits an eight-consciousness body, where there is then the parikalpa of perceiving various objects; that which perceives objects is called the Buddha, and relying on it defilement arises, hence it is also called blood. Using the three uncontaminated wisdoms of emptiness, signlessness, and wishlessness to sever the defilement of false awareness of those eight consciousnesses is called shedding the Buddha's blood with an evil mind.