Hi folks,
I'm considering having an assassin attack the party in a crowded marketplace. I know that it wouldn't be very hard for him to pull off a death attack, but I'm concerned that the players will feel that I'm cheating if he does.
Any recommendations for how to set the scene/allow them to feel that they've adequately had a chance to spot the guy? Obviously they get perception checks, but we're talking about a high stealth score, as well as a disguise. Even if they spot him, it's a sense motive check to determine that he's actually out to get them.