When Luke Beckstrand was racing Joe Moravsky during the round of 16 on “American Ninja Warrior,” there was a moment when the camera zoomed in on the sidelines to show Beckstrand’s older brother, Kai, emphatically shouting “Go!” over and over.

Seventeen-year-old Luke Beckstrand had taken a moment to catch his breath before navigating the next obstacle of the course — which had allowed Moravsky, an “ANW” legend who has competed on every season of the show since 2013, to catch up.

Kai Beckstrand couldn’t hold back his reactions as he watched the race unfold. In that moment, he was a proud older brother wanting his little brother to do the best he could — to move forward in the competition.

But he also knew that his brother advancing to the next round would lead to an unprecedented, bitt

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