Sometimes in life, we do some efforts upto a level and then leave it assuming it will happen as we are expecting, others will do from here onwards. Remember you and your efforts are only responsible for the result. for eg. A cricketer is not good finisher if he throws his wicket before his team wins!
One should make enough efforts to fulfil their goals, mission. You should think about each and every possibilities that can happen and make sure none of them can be hurdle in your goal. If you see, something can be a problem, react immediately. Even a 1% possibility is there which can be a problem, let’s not ignore that and think and act to correct it.
Also when unexpected situation arise, stay calm, take a pause and start thinking the solutions to overcome it. As a leader, you have no option to cry for your bad luck of the situation happening, you need to accept it and overcome it asap.
Remember, Most of the time, end result is what appreciated, your efforts that not yielded result, are zero!