If I equip Stealth Device on a Fireball, would it get instantly deactivated the moment 'Explosion with Wings' triggers?

Nope. Stealth device is lost when you "suffer damage", explotion with wings "expose" (or deal in setup) a damage card, it doesn't make you "suffer" any damage.

The damage card exposed could in turn cause you to suffer damage though.

I'd say yes it would get deactivated. Charges are placed in step 1, where as implicitly fireball with wings can't be resolved until your damage deck is ready (i.e. step 6)

@4N-DY , Nope. Smuggler is correct. Sealth Device is looking for damage dealt. Being dealt a damage card, or exposing a damage card does not, by itself, count as being dealt damage, so they would not (by themselves) disable Stealth Device.

That said, if he exposed a Direct hit, causing him to suffer a damage, that *would* disable stealth device.

the section on damage can be found on page 8 of the rules reference. in essence, the reason explosion with wings does not lose you the charge on stealth device is that being dealt a damage card is just one possible way to resolve suffering damage, like loosing a shield. funnily enough, it is not in and of itself suffering damage, just like loosing a shield is not in and of itself suffering damage.

12 hours ago, meffo said:

the section on damage can be found on page 8 of the rules reference. in essence, the reason explosion with wings does not lose you the charge on stealth device is that being dealt a damage card is just one possible way to resolve suffering damage, like loosing a shield. funnily enough, it is not in and of itself suffering damage, just like loosing a shield is not in and of itself suffering damage.

Thank you, that's exactly what I've been looking for - much obliged!