RE: When a transaction goes bad?
Take your knocks and move on. Consider the episode as a lost/crashed airplane where something was learned. Expectations are that you’re going to lose an airplane through many causes, dumb thumbs, dead sticks, mid-airs, etc.. Consider this as another cause, learn from it, and then move on.
Also, this person will one day get his comeuppance that will give you a healthy laugh. I always like to laugh out loud when someone I don’t like (and sometimes do like) crashes their plane at the club field. Maybe one day soon you’ll get that opportunity. Practice your “witch laugh”.