Ok, let's see if I can 'break it down' for everybody and hopefully help clear a few things up here.
1st off, I'd like to state once again that I personally believe the "
Royal Oppression"/"
Vampire Lord" ruling is incorrect and seriously needs to be corrected or updated or removed.
Ok, now on to the 'splainin'-------------
Part 1.
Same scenario as Fiction initially posted.
Player A activates "
Call of the Haunted" targeting "Mobius" in the Graveyard. (Link 1)
Player B chains his face-down "
Royal Oppression" to "Call", flipping it face-up. (Link 2)
Player A does not respond.
Chain link order Link 1 -> Link 2
Chain resolves in reverse order. (Link 2 -> Link 1)
Link 2:
"
Royal Oppression" resolves but CANNOT be used until the chain completely resolves. This is because you cannot interrupt the resolution of a chain with ANY Triggered or Ignition 'like' effects. They MUST wait for the current chain to finish resolving BEFORE they can be activated and/or be triggered. HOWEVER; most, if not all, continuous effects CAN interrupt the chain resolution. This is why "Call" being chained to a Trap Card, or series of Trap Cards, to bring out "
Jinzo" will be able to negate all of the Trap Cards waiting to resolve in the chain. "
Jinzo"s effect is continuous and immediately becomes active once the effect that brought him to the field resolves completely. This is also why the "Call" + "Jowgen"/"Last Warrior" combo works to stop any Special Summoning effects in the current chain from resolving properly. The effects of both "Jowgen" and "Last Warrior" are continuous and become effective as soon as the effect that brought them to the field completely resolves.
Link 1:
"
Call of the Haunted" resolves and "Mobius" gets Special Summoned to the field. Remember, you are still resolving an effect so there is NO chain point here, there is NO place to 'interrupt' the Special Summon.
At this point, the Special Summon is complete and CANNOT be negated, the timing for such things has been missed.
Now that the Special Summon is completed, both players can now RESPOND to the Special Summon with the
Appropriate Spell/Trap cards like "
Bottomless Trap Hole" or "
Torrential Tribute". "
Royal Oppression" CANNOT be used during this response window because there is nothing for it to negate. The
Appropriate timing has been missed. The same goes for "
Horn of Heaven" and "
Solemn Judgment", but that's another thread topic.
Now, as I'm sure we're all WELL AWARE OF by now. Had "
Royal Oppression" already been face-up when "
Call of the Haunted" was activated, then Player B could have chained the effect of "
Royal Oppression" to the activation of "
Call of the Haunted" and stopped the ENTIRE activation AND effect from resolving.
There's more coming, but I hope this helps some...for now at least.