Has this ever happened to anyone?
I was finishing up with running the Haunting and the PC's are trying to break through to where Corbitt is hiding. He toys with them for quite a while with his Dominate spell by getting them to shoot each other but the game is getting monotonous and Corbitt is running low on magic points so what the hell, he decides to throw the Dimensional shambler at them. He summons it just fine but rolls a 99 to bind it. The PC's just hear horrible screaming and "Stay back, stay back", and then silence. It almost would have been better to massacre them than to have such an unsatisfying ending!! They made it to Corbitt's chamber but found nothing but some summoning circles and symbols o the ground. It just seemed so anti-climactic but if a villain is going to throw something like that at the players there ought to be risks. Next time, for the sake of the cinematic I suppose I should have had them break through just in time to see Corbitt finish the casting so they could lose SAN from him and the shambler. I've been doing this for a long time but I feel like a made such a rookie mistake it was embarrassing, but I got so into Corbitt's mind set and his desperation to survive that, in the heat of the moment, I overlooked the fun aspect. I mean, the guy has nothing to do but lie around all day and think what he will do if attacked!
So what do you all do? Do you fudge your keeper rolls in the player's favor, or in favor of the most interesting story outcome or do you you fudge them at all?