So, I have this big encounter set up. It's got everything; there's monsters and traps and a big set-piece battle to bust into an enemy fortress! The players are all ready to go, and then the warlock says those dreaded words....
"I'm gonna use Diplomacy."
Oh god. He's level five, and he rolls a total of 32 (18 on the die + 4 charisma + 5 trained + 5 power bonus), so now I have to deal with it.
Well, he tried to talk the hobgoblins into letting him pass, and his check result certainly supported it, but I didn't want to let this big set piece go to waste (and there wasn't really any way to insert it later), so I had the hobs accept his claims of friendship but stand firm by their orders to let none pass, and therefore allow him to leave peacefully if he chose, but he'd have to fight his way in anyway if he wanted to go on. (Which they had to, so they wound up doing the fight anyway.)
How do I deal with this sort of thing? I felt bad that I essentially screwed him out of any benefit of his massive diplomacy roll, but at the same time Beguiling Tongue is an encounter power! So I can expect to be seeing this a lot in the future.
How should I handle trying to talk his way out of a fight?
I guess making one good talk roll should count sort of the same as making one strong attack roll, so it should remove a minion or two, or demoralize one normal monster, or something else that's approximately what one good attack roll would do. Even then I know he probably won't be happy with it, because I know he's angling to try to bypass the battle totally. Intimidate has some rules for how it might interact with combat, but Diplomacy and Bluff? I have no idea.