Achievement unlocked

Sadly a fairly typical HoC email exchange

Subject: Re: And? So? But? or?
From: Blackwalt
To: Coxxorz, Stormblade, Graybush

I'm playing on my own again tonight aren't I?
Although, admittedly, I haven't confirmed that I am playing....

Subject: Re: And? So? But? or?
From: Stormblade
To: Coxxorz, Blackwalt, Graybush

Actually I will be around. If Graybush shows up ... ZOMBIES!!!!
I don't expect to see Coxxorz, but if he does show it adds the "save rogue teammate" challenge to the game.

Subject: Re: And? So? But? or?
From: Coxxorz
To: Blackwalt, Stormblade, Graybush

ACHIEVEMENT UNLOCKED: SAVED ROGUE TEAMMATE

Not surprisingly Blackwalt, Stormblade, Graybush spent most of the evening killing Nazi Zombies with not the slightest sign of Coxxorz ever appearing.
It's not so much that he didn't show up but that he denied us our chance at the achievement.