If you break a spoke while on the road and your wheel is so far out it will not spin freely and do not carry a spare spoke (we non-touring types almost never do) clear or tie the broken spoke out of the way and then compensate for the missing spoke by tightening up the two adjacent opposite pull spokes each side to take out the worst of the wobble. Then back the brake adjustment off with the quick release or the adjuster if you need to to get rid of the rub, and it can be enough to get you home or to a shop for repair.