It looks like the thread was deleted? I don't know why, but the event idea was constructive, on-topic, and worthy of discussion. I don't see why the idea should get lost.
IIRC the idea was to have a boss level NPC that would help an outnumbered defense team sally forth from an objective to try to break a siege as a means to incentivize an "all hope is lost" fight. I found the idea to incentivize fights to be superior to more heavy-handed solutions such as the old oasis event in the desert bl that basically let an attacking force into an objective for free.
In addition, why not bring back the old siegerazer that helped siege an objective?