[quote=@Sathanas Rex]
Passatas are footwork, yes. A gran passata is when you move your non-dominant foot forward and then follow that with an attack, like what Brennus did. It lets you shoot forward great distances, but is also somewhat unwieldy.

As long as what's happening is understandable, everything is fine, then. 
[/quote]

Maybe I made a mistake somewhere, I'll re-read my post, but I'm fairly certain Brennus moved forward on his dominant foot (right foot) because he's right handed while simultaneously striking down with his sword. 

As for the technical terms bit, I'd only really use technical names for things which can be googled to quickly get an image of them because it's much-much easier than trying to explain where every part of your body is. I did however also include a brief explanation of what the stance was afterwords. 

Read my post, no mistake, he stepped forward on his right foot.