Once the Exit Gates are powered, No One Left Behind activates:

Increases your Unhooking and Healing speed by 30/40/50 percent.
Grants 50/75/100 percent bonus Bloodpoints for actions in the Altruism Category.
Grants the unhooked Survivor a 7 percent Haste Status Effect for 10 seconds.
The Auras of all other Survivors are revealed to you.

The Auras of Generators are revealed to you within 32 metres.
Each time a Generator is completed, Visionary is deactivated for 20/18/16 seconds.

Increases the Action speeds of other Survivors in Healing, Sabotaging, Unhooking, Cleansing, Opening, and Unlocking by 15/20/25 percent while they are within 8 metres of your location.
This effect lingers for 15 seconds when leaving Leaders range.
Survivors can only be affected by one instance of Leader at a time.

After stunning the Killer by any means, Parental Guidance suppresses your Scratch Marks, Pools of Blood, and Grunts of Pain for the next 5/6/7 seconds.