After hooking a Survivor, THWACK! activates:

The next time you break a Breakable Wall or a Pallet, all Survivors within 28/30/32 meters of your location will scream and reveal their Aura for 4 seconds.

Unlocks potential in ones aura reading ability.  Reveals dying Survivors auras when standing within a 36 meter range.

Each time a generator is repaired, all windows and vault locations within 32 meters of it are blocked for all Survivors for the next 30 seconds.

Survivors who take a protecti0on hit are inflicted with the Broken status effect for 80 seconds.

Broken prevents Survivors from being healed.