GM Whispered Me?

That would freak me out.

It would freak me out too. I usually leave the Arm for last, and I'm unaware if a GM would even know that

a) The arm doesn't damage you
b) That people usually have afk there for drops....

So it could look fishy enough to ban.

I can't see the screenshot for some reason, but it's not the first instance I've heard of Gm's entering boss maps, I hear they've been warning people around Empress too, in Scania at least. But it's always via those Blue Boxes you press ok on.