Grottenschrat

Hey there. I've startet an Dual Pistol / Ninjatraining Blaster and there is a question... My question is tied to the skill Shinobi. This skill not only granted stealth to the user, it gives bonus dmg to the first hit out of stealth. But in the detailed info, there is an +25% dmg boost to all dmg. is this only for the first attack, or do this bonus counts for every single attack?