Game Mechanics: Sieving Master Yael

[khofuswiftclaw]

Apologies if you've seen this one before, but Master Yael stops death touching due to sieves. I never understood death touch to require mana. In recent months, <Kingdom> on green has been using sieves to prevent Yael from death touching more than once (or sometimes not at all). This has trivialized the encounter and made it difficult for other guilds to compete since they have essentially parked farm toons down there and it only takes a monk and shaman to kill. Yael is also not a raid mob, so maybe this is cool. I think it's cool they figured out that once sieved Master Yael ceases to death touch, but I'm wondering if that's actually how Yael is intended. Maybe this belongs in the Bug forum? IDK. Any clarification would be awesome!