I've read that the Hand of Shallya necklace trait "clears any wounds". Does this mean it clears the wounds from everyone affected by the 20% heal?

Edit: I know Chain Reaction gives THP from Second Wind, I just don't know how to quantify it.

Does anyone know how much THP Unchained's Chain Reaction gives when used with Second Wind? I imagine the stagger scales with distance from explosion so it's hard to get proper numbers - so alternatively - is it a good pairing of talents when using coruscation staff to set hordes on fire, or with flame sword/dagger/flaming flail?

Also should I be using a different staff on unchained? I like the coruscation staff for helping to clear hordes, but it's probably pretty pointless with how much melee damage Unchained has anyway.

Also, does anyone have a link to a guide or anything that can help decide which THP talent is generally best on which weapons? I'm struggling to work it out for myself on some of them.