What? Are you trying to compare Trayvon Martin's miscalculation to a pilot's miscalculation in a training exercise?
I hope I am confused.
What's confusing to you? Tim, while a skilled pilot, made a miscalculation in what should have been a "routine" maneuver and it cost a couple people their lives. Trayvon made a miscalculation concerning character, abilities, and equipment of the man he assaulted. In both cases, people got dead because someone made a miscalculation.