大般涅槃經集解 2.59

2.59

案僧亮曰：釋心得自在也。僧宗曰：惑在由於諸根；諸根既調，所以惑盡也。寶亮曰：此兩句釋殺賊也。諸煩惱賊所以而盡，由攝六情、制三業故也。

Sengliang states: This explains their minds having attained mastery.
Sengzong states: Delusion exists due to the faculties; the faculties having been subdued, delusion is therefore exhausted.
Baoliang states: These two phrases explain "slayer of foes". The reason the foes of affliction are exhausted is that they restrain the six senses and control the three karmas.