Yea, i thought it was a bit harsh too...I should have had Mordecai be more chastising.
It is hard in PBP to not seen something as a player when an IC interaction takes place 100 feet away. When something like what happened was spoken a 100feet away, yet still in the IC post...the player can't un-see it....not sure how what would be the prevent something like that except start having spoiler blocks all over the place. Which I would hate as it ruins the flow of the story from a readers point of view. I guess as a player, just be cognizant of that, and have your character act appropriately.
The Black Company and Fallout