I have a question. If you can't chain
Horn of Heaven/SJ to negate the Special Summoning of V. Lord or Phoenix because they can't negate the effect (and once that effect resolves, there is nothing that can be done as "the entire summon occurs inside the resolution of the effect"- novastar), then how does Jowgen+
Call of the Haunted stop the special summon from occuring?
I am asking this, because Call + Jowgen doesn't negate the effect, yet it stops the special summon from occuring (this was one of the points that I was trying to make in the first place). How can Call + Jowgen stop a special summon if "the entire summon occurs inside the resolution of the effect" and Call + Jowgen does nothing to negate or prevent the effect (since it was activated before Jowgen appeared on the field, Jowgen could not prevent the effect's activation). I can't find any ruling on Jowgen that says that is does anything to the resolution of an effect that it was not around to prevent.
The only thing that I can think of is that the Special summon of a monster does not occur within the effect that special summons it to the field. If it did, then wouldn't Call + Jowgen be powerless to stop it?