def generate_child(actor, prototype)
    child = super
    child.vector += actor.vector
    child.size = actor.size / prototypes.length
    child
  end
def generate_child(actor, prototype)
    child = super
    child.vector += actor.vector
    child.size = actor.size / prototypes.length
    child
  end
Calls super method.
Also adds actor's vector to child's.
Finally, reduces child's size to actor's size divided by number of shrapnel pieces.