Lightning Orb Problem

Lightning Orb Problem

The new version of Lightning Orb let's you add a %chance to activate a spell/ability on the target.

I have mine set to do a chain lightning every 10% of the time someone hits with it. Well it works fine except for one thing...

Everytime the unit is attacked by an enemy unit, the game makes that unit you control respond to the attack. This is a good thing, but for some reason the chance on hit doesn't work anymore until you issue your unit to specifically attack that unit. So if you cast a spell and let it go into auto attack mode it won't trigger the item ability anymore. I bumped it up to 100% to test it and it seems to be the case.

Is there something I'm leaving out on an ability setting for it?

the only solution is to order a unit to "attack" its target, try this:

event- unit is attacked
condition- attacking unit has ability (orb ability)
actions- order attacking unit to "attack" attacked unit

What condition is that? I couldn't find one that allows those parameters.