182:/std/living/spells.c (/std/living.c)
(public int) interrupt_spell()
/*
 * Function Name: interrupt_spell
 * Description  : Attempt to interrupt a spell cast.
 *                This currently has a very small chance of breaking the
 *                the casters concentration.
 * Returns      : 1 / 0 - a spell was interrupted / not interrupted
 */
