Human error? The whole fucking farce is steeped in errors made by humans, and they roll out that crock of shit as an excuse for this weekend's horseplay!
Guess which frame to use - Error
Guess which position to draw the "furthest back point" line on the defender - Error
Guess where to draw the line across the pitch for the defender - Error
Guess which position to draw the "furthest forward" line on the attacker - Error
Guess where to draw the line across the pitch for the attacker - Error
Every part of the process involves errors due to guesswork by humans. I think, "Sorry, we fucked up cause we're lazy arrogant pricks" would've been closer to the mark.