The original post made it seem you were the lessee, not the lessor. If you lent bees on a honey split, your contract should have included specific dates by which the honey supers had to be pulled and the bees treated. If the other party failed to perform for any reason and you suffered losses as a result, I imagine they could be held liable for those losses. Certainly does not seem fair that they sacrificed a large number of your bees to obtain an additional amount of honey, assuming an ongoing flow was the reason they waited.