After repairing Generators for a total of 70/60/50 percent, Flashbang activates:

Enter a Locker while empty-handed and press the Ability button to craft a Flash Grenade.
The Flashbang is left behind when escaping the Trial.

Increases your Repair speed by +15 percent for each other Survivor within 4 metres of your location, up to a maximum of +45 percent.
This effect is also applied to all other Survivors within that range.
Grants 50/75/100 percent bonus Bloodpoints for Co-operative actions.
Survivors can only be affected by one instance of Prove Thyself at a time.

Whenever you complete a Generator with at least one other Survivor, Friendly Competition activates:

Increases your Repair speed, and that of the other Survivor(s) who completed the repairs with you, by +5 percent for the next 45/60/75 seconds.

Your acute senses are on high alert.
Whenever the Killer destroys a Pallet or a Breakable Wall, or damages a Generator, their Aura is revealed to you for 3/4/5 seconds.

Increases your Recovery rate from the Blindness, Broken, Exhaustion, Exposed, Haemorrhage, Hindered, and Oblivious Status Effects by 20/25/30 percent.
This effect also applies to all other Survivors within 8 metres of your location and lingers for 15 seconds.

You have an uncanny ability to escape the inevitable. While in the Dying State, 50 percent of your Recovery progression is converted into Wiggling progression, up to a maximum of 40/45/50 percent, once you are picked up by the Killer.