Bingo! A person can’t place 100% responsibility on the BO when the person has the ability to mitigate the damages. There’s both “contributory negligence” and two types of “comparative negligence,” which varies by state. These are good explanations:
https://www.law.cornell.edu/wex/contributory_negligence
https://www.law.cornell.edu/wex/comparative_negligence
It also depends on what your board agreement says about the condition of the facility and what they promise to provide. And what, if anything, you agreed to release them from. As well as the inherent liability law.