survival ring blades
honestly I could not imagine completing that achievement in the legit way.
Instead, stand at one end of the arena and put raid markers on the 5 or so pandas that come closest to where you are standing. This makes it easier for you to see them approaching. Then when you are ready, step a few steps into the arena until you are between 2 blades. Stand in that spot until you see a panda starting to come toward you. Quickly glance around, assess where the other pandas are moving to, and then move a few steps into a clear area. Stand in that second spot until you see another panda approaching. Assess again, then move back toward your original spot - if not the exact spot, then somewhere close by. Repeat. Keep your movements within as small an area as possible - wandering into another region of the arena may put you in the path of a panda you're not keeping track of.
Here's a video that shows basically the same method: http://www.youtube.com/watch?v=L70fx8aMNwI
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