Survival Tome: Lock and Load I

"You have a chance when you trap a target with Freezing Trap, Freezing Arrow or Frost Trap and a chance when you deal periodic damage with your Immolation Trap, Explosive Trap or Black Arrow to cause your next 2 Arcane Shot or Explosive Shot spells to trigger no cooldown, cost no mana and consume no ammo. This effect has a sec cooldown."