This was released very long ago, but seeing how Gunner is just a few days away, I figured it would be a nice refresher now that its release date is extremely close!
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[video=youtube;fgK_IcXDcjI]http://www.youtube.com/watch?v=fgK_IcXDcjI[/video]
Shooting Rush Summary
1. When you use shooting rush, you technically teleport to the end point of the skill immediately, despite being in mid animation.
2. During the animation, you cannot BE TARGETED by the enemy. The end point of the animation is vulnerable though.
3. However, if you get hit by thunder/ice spear, you can still "die" but you will finish the skill and DAMAGE all targets, so in a way, the hits will LAND whether you live or not.
4. It is possible to dodge fireball completely, granted you use the animation to rush out of its explosion radius and not blocked by any obstacles.
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The highlights is that you cannot be targeted during midanimation... and for some reason it causes some monster AI to do weird things like an archer will just stand there in shooting pose for the longest time until it decides to use a new skill or Shadow Alchemists running up to you with a skill loaded but not executing it.
However if the enemy cast it on you as soon as you execute the skill, you will be hit with it. Remember to take lag into consideration since it may seem the enemy actually hit you in mid animation, but in truth they actually hit you before, but you just now received their animation packet.
Short Version: Shooting Rush give you hyper armor.
What is hyper armor?
http://www.gamespot.com/demons-souls/forum/what-is-hyper-armor-54338035/
Hyper Armor: Any attack whose animation or damage cannot be interrupted once executed, even if hit or blocked by an enemy.