If this is not an indication for application of Rule 17 what is?

I'll give you an example.

Saints have the ball on their own 30 yard line, down by 4, with the clock running at 7 seconds remaining in the game. Brees takes the snap, and pitches to Kamara. Kamara breaks around the end, and has clear sailing to the endzone. He is running for the touchdown, and a fan runs out of the stands and pushes him out of bounds. The officials confer and rule him out of bounds, and the game over.

The fan running out onto the field is something "outside the tactics encountered in professional football. "

Or...Kamara is running for the endzone, and a hanging light falls from the ceiling, he stumbles over it and the ball comes loose and bounces out of bounds....again...something that is "outside the tactics encountered in professional football. "