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All we know is that Breath of Heaven is a direct heal. Other then that, we don't really know anything. I'm guessing it does omit passive healing like mantra of healing or Reclimation rune on Conviction. As for other rune effects that add heals to otherwise normal skills such as soothing breeze on Cyclone Strike, your guess is as good as mine.
But according to the skill tooltip, I think it's safe to say that if you don't hit another player or theoretically a follower, you won't get the bonus.
If you look at the wording of "Mantra of Healing", it's very unlikely it triggers the Passive. It talks about "increased Life regeneration", which technically isn't a heal. I'd guess that's exactly why the Passive is worded the way it is. You'd have to actually cast something for it to be a "direct" heal.
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