Arthur appears at the lab's entrance, struggling as a minion hangs on to him.
Snatcher gives the minion an order and the minion talks back to him—turns out it was Herbert in disguise.
No one attacks Herbert, since they've all learned to fear his walloper. Herbert smashes the railings keeping everyone captive, and then smashes a hole in the wall so they can escape.
Snatcher has his minions start to shoot at their escapees, using blunderbusses loaded with random household scraps.
Still, everyone manages to escape through the hole in the wall, and off they go.