public override void Do(Mage caster, Spell origin_spell)
{
if (projectile_prefab.GetComponent<ControlledProjectile>() != null
&& !caster.ManaSlotAvailable())
return;
Projectile p = Instantiate<Projectile>(projectile_prefab);
p.Initialize(caster, caster.cast_point.position);
ControlledProjectile cp = p as ControlledProjectile;
if (cp != null) caster.FillManaSlot(cp, origin_spell);
p.GetRigidbody().AddForce(GeneralHelpers.RandomDirection2D(), ForceMode2D.Impulse);
}