Preventing damage

If a card says "prevent the next 2 damage dealt" but doesn't have an expiration date like at the start of your round, and you continue to stack damage prevention effects?

 

for instance, the wraith says "prevent the next 2 damage dealt to the wraith" but if she takes no Damage, can she stealth again to add another 2 points of damage reduction?  I imagine this isn't the case at all, but I just want to double check

That is exactly the case. If she takes no damage she could use stealth again and gain an additional reduction. Making it reduce the next damage taken by 4. Though it would be fairly sad if a attack deals her 1 which would get rid of all her reduction. But it is nice when you can for see a massive attack coming out and getting her next turn!

 

In order to stay clear on how this works, in my mind I transform it to "Prevent 2 of the next damage dealt".

Why is this the case? "Prevent the next two damage that would be dealt" seems like pretty ambiguous language, so I assume there's been an official ruling?

Also, going through the incapacitated heroes today I noticed two different wordings of this: "Prevent the next two damage dealt" (e.g. on Bunker) and "Decrease the next damage dealt by two" (e.g. on Haka). The latter pretty clearly indicates that it only affects one instance of damage, so I'd assume that the different wording implied a different effect... though on the other hand if they did work differenty then having them both active on the same hero would be a rules nightmare.

In the enhanced edition, all (or at least almost all) references to preventing damage with a number have been changed to use the term "reduce," such that there is no conflict to whether it can decrease irreducible damage.

I just checked the Heroes errata for 1st Ed owners. In Bunker, no change was made to Bunker's incapacitated side. To confirm, in EE, was Bunker's incapacitated power errata'ed from 'prevent' to 'reduce'?

My copy of enhanced edition still says 'prevent'.  I just assumed this was because incapacitated abilities weren't looked at as closely, and I treat it just like 'reduce'.