<p>These nerds are more crafty then making a simple trap. The pulleys let them have access to the boulder from a distance and as pyramid said, with minimal effort, while the folcrum helps them dislodge the boulder and fling it at you, meaning that it doesnt have to be ontop of you in order to achieve its goal.</p>
<p>Ehm. Nerd power again.
They somehow figured out how to make the boulders invisible. Maybe they're channeling Harry Potter...</p>
<p>Why did you go Greco? I keep thining GekoPrincetonian now.</p>
<p>lol (ten x 10 to the 10 characters)</p>