While standing in a Locker for 3 seconds, Head On activates:

When performing a rushed action to leave a Locker, stun the Killer for 3 seconds if they are within range.
Head On causes the Exhausted Status Effect for 60/50/40 seconds.

Head On cannot be used when Exhausted or when you have accrued Idle Crows.

Whenever you become injured, you retain the Movement Speed burst for 2 additional seconds.
Overcome causes the Exhausted Status Effect for 60/50/40 seconds.
Overcome cannot be used when Exhausted.

Increases the Repair speed of any other Survivor by 6/7/8 percent, while you are being chased within 24 metres of the Generator they are currently repairing.

After being unhooked or unhooking yourself, instantly gain 40/45/50 percent to your Healing progress.