When you use the Hardened Shell on them, they travel so far so fast, they are usualy 1,000 feet in the air before it actually hits, then hilarity ensures.
The nice thing about Halaa is you can get them from the islands, if they aren’t paying attention, from on top of the buildings, or as they hover above the water, which is only safe in a very narrow margin. Otherwise, splat!
I say this since in world pvp, the other pvpers are Alliance, and usually raid geared, which is 100k-300k or more hp on you plus thousands of stats more. You have to be clever and use terrain and other objects to get the upper hand.