drop EQ

Witam, mam taki skrypt:

on spawn of zombie or skeleton:    if tool of event-entity is sword or shovel:        cancel event    if chestplate of event-entity is not air:        cancel event    if leggings of event-entity is not air:        cancel event    if helmet of event-entity is not air:        cancel event    if boots of event-entity is not air:        cancel event

ale i tak zazwyczaj nie działa. jak usunąć drop wszelakiego pancerza itp z mobów?