OP, here is a little bit of wisdom from one of my flight instructors back in the day:
"All throughout your career you are going to have this one guy who is TRYING TO KILL YOU. That guy is Joe. Even if you are the best pilot the world has ever seen, Joe will be out there TRYING TO KILL YOU. You won't know who Joe is but you better keep your eyes out for him, because HE IS TRYING TO KILL YOU. Joe might be a pilot in another plane, he might be an ATC controller, or your copilot, or even that lazy ramp guy that puts the wrong fuel in your plane. Joe could be anywhere at anytime and HE IS TRYING TO KILL YOU! No matter how hard Joe tries to sneak up and kill you, your job is to make sure he fails. Always, always, always keep your eyes and your ears open looking out for Joe!"
OP you might have caught a glimpse of Joe.