How do I counter-block the spinning Gasfellas?

Solution 1:

EDIT: It turned out that I was wrong about the player being able to succesfully counter-blocking a spinning gas-fella, and as promised here is a video of me trying to prove it:

I try with standard blocking and the Mirror Shield secret skill, neither one successful.

It is possible to counterblock them though it is quite difficult. All you have to do is wait for them to get really close to you and hit block right before they hit. This is really difficult though so I would recommend that you just evade them and use ranged weapons to defeat them.