You stealth mission a bust, Frederico says he knows what to do. He advances out into the night, snapping his finegrs, and looking menacing in a way that's only believable in a world of musical theatre.
The goblins get up, and in a carefully calcuklated musical number that looks like it's been carefully rehearsed, but for the purposes of this example are supposedly done on the fly, they proclaim in a song-and-dance number that this is Jets territory, and eagerly go with the dance-off to determine what happens next. If they win, it's combat. TO THE DEATH.
Roll for dancing, for what you want to happen if you win, and for Hanz and Thron's actions, if you want them to help.