Look at where Kamen Rider Black RX stabs his Revolcane. :)

Look at 1:03 where Kamen Rider Black RX thrusts his Revolcane upwards towards Bosgan's groin. Ouch! That's gotta hurt.

Dem extra sound effects

...Actually, it made contact with his chest. It came in from a low angle and rose up, and for a split second it does look like it hit between the legs (would make for a good out-of-context screen shot), but then the sword rises all the way to chest level.

Also, that dub is weird. Those sound effects are strange and don't quite match the audio quality of anything else. Listen to it with headphones; it's freaky.