public void Rule1(float dt, World world)
{
Projectiles = (
(Projectiles).Select(__ContextSymbol13 => new { ___p11 = __ContextSymbol13 })
.Where(__ContextSymbol14 => ((__ContextSymbol14.___p11.Position.Y) > (-50f)))
.Select(__ContextSymbol15 => __ContextSymbol15.___p11)
.ToList<Projectile>()).ToList<Projectile>();
}