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I actually figured it out, so nevermind.
To answer your question; 4.5.2, and Windows 8.1
The reason it didn't work was because I apparently have Infinite HP on, because if I turn that on first, Mercy or Attack won't apparently work.
It's weird. :7
I would think of it like the Mini-Yoyo mechanics when you have 3-4 combo. Mini flails circle around the arch of the sword as you swing it. Though that would basically make it a larger arch of damage - seeing as the flails basically circle around that arch.