<p>I've figured out how to recreate this bug.
</p><p>1. Attack the base to get the paratroopers to show up.
</p><p>2. Grapple onto the the H-62 Quapaw and kill the passenger with the Revolver.
</p><p>3. Hijack the H-62 Quapaw when you hear the message "backup team on the way".
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<p class="MsoNormal">4. Land the H-62 Quapaw somewhere, preferably <span style="mso-spacerun:yes">near the water and destroy it. The soldiers that spawn will make a beeline for you, so make sure to get a minigun ready.</span></p>
<p class="MsoNormal">5. Endlessly kill the soldiers that spawn until you get bored.</p>
<p class="MsoNormal">You can also destroy the H-62 Quapaw after it starts dropping paratroopers instead.</p>
<p class="MsoNormal">Note that the kills in the last 60 seconds cannot go above 30-36 (likely because the developers never intended for the player to face this many enemies at once).</p>
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