I've received the lung of this sadhana but it wasn't explained what 'protection' means.Meditation on the Three-Layered Protection Wheel of Chandali by Jigten Sumgon
This sadhana, composed by Jigten Sumgön (1143-1217), contains the practices of Avalokitesharva, the wrathful deity Achala, and Vajrayogini woven into one. It is designed to be practiced when doing the practices of chandali (tummo or inner fire meditation)
What does 'protection mean in the context of this sadhana?
How does this short sadhana fit in with the collection of practices of Lord Jigten Sumgon and the Drikung Kagyus?
Any insight would be most appreciated.