What is it that makes SHD/Fort simultaneous? Is it because they have a similar effect (trigger not assessed)? Or is it because Fort might have an implicit trigger of "whenever you would be dealt damage" similar to SHD (trigger assessed)?
If we can boil down what exactly gives SHD/Fort its simultaneous status, we can extend that to other interactions like redirection and prevention. But as Phantaskippy pointed out, there may not be a right/wrong way anymore to how these things resolve, which is the single most infuriating/beautiful thing about the ruling.
I'd like to attempt to distill a methodology for navigating the new official order of operations. But to do that, I need a set of premises that I need to assume are true. Here I have 3 premises that I fully believe to be 100% correct that will guide this new method:
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The Order of Operations ruling contains two truths, that A) SHD and Fort. are simultaneous effects and that B) simultaneous effects are resolved in the order of the players choice
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For two or more effects to be "simultaneous", they must occur at the same time.
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The timing of any particular Effect can only be conveyed through its associated Trigger
(If anyone disagree's with any of the above premises, I would be interested in hearing so)
If [1A] is correct, than it follows that SHD and Fort, then they must occur at the same time, as stated by [2]. Timing of effects are the exclusive property of said effect's Trigger clause as stated by [3]. Having said that, the conclusion I am reaching here is that SHD and Fort must have similar triggers.
SHD has an explicit "when you would be dealt" trigger. Fort, on the other hand, as is the case with the vast majority of damage modifying effects, does not contain an explicit trigger clause. Since we have already deduced that Fort/SHD must have similar triggers to be given simultaneous status, we can infer that Fort. has an implicit trigger of "when you would be dealt".
Here is where the dangerous part comes in. If we are now saying that Fort. has a defined implicit trigger, might we extend that implicit trigger to all damage modification effects that otherwise have no explicit trigger? That would seem to be the logical leap here. If the implicit trigger on Fort. reads "when you would be dealt", I imagine effects that increase damage would have an implicit trigger of "when you would deal".
If those type of effects share a "would deal/be dealt" trigger wording and are simultaneous with eachother, then we can go ahead and say that other "would deal/be dealt" triggers would fall simultaneous with those as well. This would include redirection effects, such as Driving Mantis, and the prevention mechanic as it is worded on Undaunted.
If all of those things are truely simultaneous, maybe these is a way to boil down the whole damage dealing proccess into a neat little package.
I propose splitting the whole resolution proccess into two distinct parts, Pre-Damage and Post-Damage.
Pre-Damage occurs anytime an instance of damage is declared. Determin the initial target, type, and amount for the damage. Then, in the order of the players choosing, may start resolving any "Pre-Damage" effect, which include any and all effects dealing with damage that are not dependant on HP being reduced. This would include damage type modifiers, amount modifiers (+/- or prevention), and target modifiers (redirection). (It should be brought up that having damage Immunity is a bit of a special situation. To keep in line with the official ruling that a damage immune Nightmist can not redirect damage with her Amulet, I will be working on the assumption that immunity does not prevent you from being targeted with an instance of damage, but it would in effect prevent "would be dealt" triggers from triggering on her).
Post-Damage occurs the moment HP starts being actually reduced, and would include damage effects that are specifically dependant on HP being reduced in some capacity, like Hypersonic Assault from Tachyons deck or Omni-X's Reactive Plating Subroutine.
Id like to hear any thoughts you guys have on this methodology or anything about the new Order of Operations in general.