I found this video of Asai Sensei
showing a variety of ways to block, a front kick.
For the first one he just kicked into the leg. with his left leg.
For the second one he cut to the inside with his left leg,
using kicking technique similar to one from Naifanchi kata.
For the third one he cut to the outside with his right foot,
straight into their groin.
For the forth one, using his left foot.
he jumps past the kick with a similar kick as from Chinto kata.
Altogether an interesting demonstration
of lower body kick blocking.