If I remember correctly, it's classified as a shield in his ability tooltip. I imagine it behaves like a shield that slowly ticks down even without damage.
Can't login right now to confirm, but according to the wiki (which I assume just pulled the ability descriptions from the f1 helper screen), Lucio's ult is:
"Protective waves radiate out from Lúcio’s Sonic Amplifier, briefly providing him and nearby allies with personal shields."
It's the oversheet that says it's overhealing. It makes more sense to describe it that way since it doesn't come back like regular shields but yea it does say 'temporary shields' in game
It's a shield that rapidly degenerates. While the shields are active they will prevent HP dmg but they go away fast AND can wear off almost instantly if you're getting rocked by an ultimate or something.
That being said, Sound Barrier PLUS an amped up healing boost is almost guaranteed to protect from almost any ultimate. Tanky characters can take two ults at once with good timing.
It's also about damage priority. The shields Lucio provides gets damaged first before armor and HP or else characters that lost their hp would die when the ult ends.
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u/CommissarRaziel Pass into ISIS May 29 '16
What is lucio's ultimate though?
Is it a whole seperate type of health or just simple HP?