How does the combo key operate, and is it necessary to press it once? Holding it down causes confusion when playing Invoker because it only casts two spells when I hold the combo key down. This also affects some of the heroes I use; holding it down causes the hero to cast but remain idle and not attack; the worst of these is Meepo, which occasionally spoofs but never completely stops. Therefore, should I hold it down or press it once?