He said level 3, not level 3 turtle skill. Joz is actually quasi official. I forget what it is, council I think? Its only 1 step down from official. They get their own secret forums, damn you Joz!
He's likely the most official response you'll get, unless you get super lucky in the LoL forums (like a 1 in 100 chance probably), which is why I like asking questions in this thread so much.
Manwith- Obviously that's not the case since that's exactly how I interpreted the passive on my first reading. I do agree that it can be a bit ambiguous, but not to the degree you imply. (and so can half the skills in the game, its just the nature of fitting in complex skills into one or two sentences)
Also, it is CURRENT health. Can you believe that crap? And ya its always been that way. Her passive really kicks in at low health since every hit is reduced by then. I wonder if they'll keep it that way... I mean still, its mostly only useful for 1v1 as it still doesn't give you tank survivability when getting focused fired, but damn. There's enough 1v1 or team fights where 1v1s occur off to the side briefly for it to matter. I've already died several times because I thought I could finish her with a nuke, then she charges and Q.
EDIT: I don't get how they can give such useful passives to some champs, but only give ~3% aura crit to TF.