Yōga Sūtra 3.39

bandhakāraṇaśaithilyātpracārasaṁvēdanācca cittasya paraśarīrāvēśaḥ।

The cause of bondage being loosened and having sensitivity to the passage, it becomes possible for Chitta to enter other bodies.

Why further dwell into Siddhis? Later additions?