I don't know about the target thing <_<
I was in a pt in the Crawler's Nest with a NIN/WAR; after the battle he went on the other side of that small webbed hill in the first room, and there was a strange, two-part explosion; he dropped dead to the ground. He was still partied up, and disbanded only when he got to Jeuno.
Me: O_O
Tank: lol
Me: What the crap was that?
Me: Oh, wait.
Me: No...
Me: O_o
Me: What the crap was that?!
So they went on to explain that it was Meijin Gakure, which I had figured, seeing as how the guy exploded. But I have a NIN job, and the one or two times I've used it, you had to have a target. I didn't see any crawlers near him though, and more importantly no pissed-off crawlers came toward us, the allies of the vicious suicidal ninja.
I still wonder about that, to this very day. Unless Meijin doesn't draw aggro?
(I don't know how that could be, since I would be very PK'ed indeed to be some NIN's bloodwarp target practice ^^)