Dwarven Domino Effect
Collapsing a mine to halt production of an army's weapons is a fine plan, but having to make sure all of the dwarven slaves get out first is health and safety gone mad. There is a glimmer of hope that things can be made easier, though, when our dwarf ally and guide drops from a Bugbear attack.
'If the dwarf dies, we wouldn't have to rescue the slaves before we destroy the mine, would we?'
'Technically not, no.'
'Is that your plan now?', asks the GM.
'Our only regret is not thinking of it sooner.'