Crossbow, Heavy: You draw a heavy crossbow back by turning a small winch. Loading a heavy crossbow is a full-round Action that provokes Attacks of Opportunity.

Normally, operating a heavy crossbow requires two hands. However, you can shoot, but not load, a heavy crossbow with one hand at a –4 Penalty on attack rolls. You can shoot a heavy crossbow with each hand, but you take a Penalty on attack rolls as if attacking with two one-handed Weapons. This Penalty is cumulative with the Penalty for one-handed firing.