I have been following all the valid queries brought up so far and many can be cleared up by following the rules literally. When things happen simultaneously, I like the idea of allowing the active player to decide order. 'Start of turn ' 1st, then 'after turn begins' next, but no 'actions' before 'Kingdom Phase' resources, restoring etc. has happened. I think 'mutation' should kill Reiksguard with 1 damage before 'counterstrike' as the latter happens 'after' it defends not as.
The question of specific damage from specific sources and which get 'cancelled' is tricky. At the moment we have to specify specific damage tokens which can get complicated but does work in most cases. What I have trouble with is the difference between 'cancel' and 'redirect'. Warrior Priests is easy as it redirects 'assigned' damage. 'Cancel' must stop 'applied' damage actually reaching its target. Defend the Border states 'redirect damage DONE to capital', which implies the damage actually hits. If that damge Burnt the Zone, or even ended the game for a 2nd Burn, there are no damage tokens to redirect. At present I play that 'redirect' also cancels the damage so it doesn't hit.
Curch of Sigmar also opened a can of worms. Card effects are 'Actions', 'Forced', 'Continuous' and 'traits'. I first had trouble with Festering Nurglings and Shrine to Nurgle, but noticed that 'Forced' cannot be cancelled so you don't have to pay. (Only 1 payment I assume for shrine not each of its victims?) However, Savage Gors continuing +2 damage for 2 developements, Choppas, Mutations etc., should have to pay. (Only once for its effect?) I have not found a 'Traits' problem yet. To solve this complication, at present I make Church of Sigmar effect 'Actions' only. Bloodthirster damage cannot be cancelled, so its specific damage must be noted, but can it be 'redirected' if this doesn't include 'cancel' (See above query)
It just goes to show how difficult it is to write 'foolproof' rules. This game did its best but in trying to keep it quick and simple, plus a few slight word differences, it will have to cover things or different interpretations will arise. Still a good game though, but expect more queries as more expansions come out. All these were from the core set only.
Cheers Richard