when is a an i20 from crouch trade ever gonna happen lol calm down Harm. It shouldn't even happen in that situation since Asta 2K (hit) 2K should come out in i15 +2 = i17.
Anything that puts Viola in crouch on hit doesn't put you at the right frames to trade with much. 2B is +2, so a WR K afterward will trade with i18s, which are uncommon (ok Sieg/Tira 3B, Algol 66B), and 2A is +8, so a WR K will trade with i12 AAs (Yoshi and PyrrhaO and Raph 6BB) and fast FC As. 2K -> WR K trades with i22, but who throws out an i22 when someone 2Ks you? And why would Viola want to do a 20 frame move up close at disadvantage? In the non-neutral game, you'll hardly ever see this. In the neutral game this move is pretty garbage too.