Take this specific example...

Before Tariff, the estimate was that if we could not break that resistance at 0.618, then we would go through wave 3 with a target range of 425 +/-

Considering the risk of Tariff, you could buy put spread of 475-425 for a 50 points range of protection, the premium would likely cost $10 for a 3 weeks options.

Of course, if the Tariff annouced was very mild, stock market will rally, and you would lose this $10. But when you consistently apply this methodoly combined with key pivot point on the wave structure, the probability will be on your side.