It's not about quests at all, but about people (newbies) going there and spending a bunch of hours, saving as usual for a couple of slots, and at the end they run into Cor Galom, who just tears them apart like a dog a heating pad. And such players usually don't have saves before Masyaf. Old players go there almost before the dungeons, and newbies get ambushed and can't get out. You should do a search for Masyaf's problems, that they can't kill.