After triggering your third Protection Hit, Mettle of Man activates:

While injured, Mettle of Man shields you from going down the next time you take damage.
Healing back to full health will reveal your Aura to the Killer whenever you are farther than 12/14/16 metres from them.
Mettle of Man deactivates the next time you are put into the Dying State.

Increases the odds of becoming the Killers initial Obsession by +100 percent.

The Killer can only be obsessed with Survivor at a time.

Increases the Efficiency of your Items by 15/20/25 percent.
Streetwise extends its effect to all other Survivors within 8 metres of your location and lingers for 15 seconds.

Upon completing a Healing action on another Survivor, they benefit from the following effect until the next time they take damage:

Increases their Action speeds in Healing, Unlocking, Cleansing, and Blessing by 12/14/16 percent.

Reduces the duration of your Scratch Marks by 3/4/5 seconds.
Your Scratch Marks are spaced inconsistently.

When healing yourself or another Survivor, Grunts of Pain and all noises related to the Healing action are suppressed:

Failed Healing Skill Checks do not trigger a Loud Noise Notification and only apply a Regression penalty of 3/2/1 percent.

After being unhooked or unhooking yourself, Off the Record activates for the next 60/70/80 seconds:

Prevents your Aura from being revealed to the Killer, if they attempt to read it.
Suppresses Grunts of Pain when injured.
Grants the Endurance Status Effect.
This effect is cancelled prematurely if you perform a Conspicuous Action.
Off the Record deactivates once the Exit Gates are powered.