The bone armor that lays in the ground that comes from necros removes the aim assist from controller and the person as a target for a second. which makes the spell not go off or the light attack miss the person completely. unlike blastbones which are targetable, bone/blighted armor or spirit mender that isnt targetable only makes you unable to cast the spell. This happens because your crosshair aims directly at the bone armor it removes the aim assist/target from the person thats close or behind it since you can see the name of the bone/blighted armor when aiming at it. PC EU with controller.