The more skilled crossbowmen know the full limits of their weapon, and can
take full advantage of their crossbow's draw. By loading more than one bolt at
the same time into the channel correctly, they can fire them all
simultaneously in a single barrage. Because the bolts are placed so closely
together, they all end up striking the same target at the same time. The
heavier, more dangerous bolts will often smack into each other in midair,
turning into a swirling funnel of razor-sharp shards.
Syntax: use bolt burst at <target> shoot <bunch of bolts>
        use bolt burst at <target>