Half-circle motions are nothing to be afraid of on Hit Box. There is some leniency in Street Fighter V that helps keep the motions consistent, and we will help provide some tips below to ensure you can rely on your half-circle inputs.
(Back) + Down + (Forward)
Back + Down
This motion can be tricky if you try to do it too fast - you can skip the Down input. To ensure you input the whole Half Circle motion, press Back and Forward at the same time with Down. The SOCD Neutral will make sure you get a Down input. Other than that, it is a simple rolling of your fingers.
Due to how Street Fighter V handles inputs, there are other ways you can input half-circles.
Tap Forward into Quarter-Circle
You can start with a Forward input and can skip the Down-Forward input.
You can start with a Down-Forward input.
And you can even simply slide your finger over the buttons to get a half-circle.
Take a look at our video overview of half-circles in SFV:
If you have any questions about Street Fighter on Hit Box, please join our community on Discord and visit the #2d-traditionals channel. In addition, be sure to explore the "Hit Box" and "SFV" tags at the bottom of the post and visit our SF Index for more How-To content.