Question about the new shield attack skill gem

So I'm trying to theorycraft a build for the new shield toss skill gem. I'm wondering whether or not it takes the base armor/evasion from the equipped shield, or if it takes the modified armor/evasion through the "increased defences from equipped shield" nodes. Any thoughts on this?Here's the gem I'm talking about. http://ift.tt/2sMmrfG via /r/pathofexile http://ift.tt/2scPWKP