This is incorrect. I did this on my Ranger, but I didn't use speed boost, swiftness, or anything else that might help. I did this exclusively by running at normal run speed and dodging appropriately and I got the achievement for not being shot on my first try. I then crashed right at the end and had to do it a second time. This time I was more careless, attempting to do it faster and I still only got shot twice. No big deal. It's not incorrect though. My point isn't that it's impossible to do as a Reaper (I completed it), or even just running and dodging. My point is that some classes have tools that can make this instance much easier, while others don't. This isn't me whining that it's too hard. I'm trying to point out that some classes are much better equipped to do this in others, which I believe should not be the case in story content. If it was a raid, fractal, a dungeon, or even just achievements, I wouldn't care. Those are good places to let classes play to their individual strengths. This, however, is the story, which is intended for pretty much everyone to play; having some classes with a huge advantage or disadvantage is bad design, in my opinion.