Burst bobstay:
This is a bad accident, as you are liable to lose your mast. Get the mainsail off of her at once. If you have a crotch, put it under the boom so as to take the weight off the mast until you have it secured. Take your jib or staysail halyards or preventer backstays, hook them to the bits or around the bowsprit close to the cranze, and heave taut. Get the yacht before the wind, if possible. Then make the best job of the bobstay you can. A watch tackle makes the best temporary repair.