Interrupt: When a character you control discard a card using pillage, kneel and sacrifice Scouting Vessel to discard 3 cards instead.
1) After Scouting Vessel is used, can Euron Crow's Eye be triggered 3 times?
2) After Scouting Vessel is used and discards 3 characters, can Ser Gregor Clegane or Corpse Lake be triggered 3 times?
3) After Scouting Vessel is used, can Tywin Lannister (LoCR) be triggered to override the the Vessel's effect?
RR "Replacement Effects" says: "the [original] triggering condition is still considered to occur."
We're somewhat confused by this entry, some are arguing that you're still considered to only discard 1 card using, so Euron can trigger only once.
Personally I think that this RR entry was written in regard to replacement effects of the type "when X happens, do X instead of Z" (e.g. Benjen Stark, Ser Davos Seaworth), while we're dealing here with another type "when X happens, do Y instead (of X)".