Issues with 'sting'.

When the 'sting' skill is used repeatedly in the same fight, it is possible to recieve the echo which signifies that it has landed fully, even if the effects of a former fully landed sting are virtually certain to still be in effect. The helpfile doesn't make any mention of 'sting''s effects being stackable or not, so I thought I should mention this as it seems possible there could be an oversight in either the skill itself, or in its helpfile.