Well, such kind of OS doesn't depend on special, and you can start it with f4,112, b31, f21 (CT), didn't test others, and some of them can be just hitconfirmed.
If you get no laser on hit then you should press B later, if you do laser on block then you should do it earlier. Pick the moment right after when the laser begins on hit.
If you get no laser on hit then you should press B later, if you do laser on block then you should do it earlier. Pick the moment right after when the laser comes out on hit.