If that's how they want it to be, they need to learn proper grammar, and/or specifically include something like the text distinguishing reactions from interrupts, if that is their intent. But as things stand, IMO the language that is in place, does NOT support the assertions you're making. In the Shield case, what is the resolution of "you have been hit"? You take damage. Thus, an effect that would lower the damage can take place as an interrupt after you've been hit with an attack, and it will affect the damage from that attack.

And, I might add: no, I'm not merging interrupts and reactions. Reactions are much more coarse than interrupts. A reaction happens after the *entire* action has been completed. The interrupt still occurs and resolves inside the action.