I've been a a member of Excelsior for a couple short weeks, but have logged quite a bit of time and not once, have I ever dealt with a "ninja looter".
Now, I'm sure most of you know what that is, if not: A Ninja looter is someone who essentially steals loot from right under your nose before giving you the chance to see it for yourself.
Not even 15 minutes ago, a guildmate of mine and I, were tackling the fearsome Horseman, when "along came polly" so-to-speak. This player graciously offered their assistance to my guildmate and I, not so much in a verbal manner, but by simply joining the fray. Literally seconds after we put the Horseman down, they used [claimall and ran from the room.
This is truly frusturating. Judging by my luck as of late, I doubt they looted much. However, that's not the point. This kind of thing, coming from someone who has been on the shard awhile, is, well... sad.
I will not mention any names.. nor will I take the time to report them to staff. Both are childish in my opinion.
Although, what I will do, is forewarn any possible future "ninja looters", that should you attempt this on me whilst in Hallow's Keep.. I'll simply sprint to Night Terror and turn him loose.. then promptly hide.

I really hope this player reads this at some point, and I truly hope that no one deals with this themselves. I feel truly sorry for players who do such things, but.. well, what can you do.
