BTW, what was the initial distance between the two, at the time of Brennus' lunge? 10 feet?
Seven is a pretty big distance. Brennus should indeed have his footwork encumbered.
However, you have yet to address the fact that as soon as Florian's hand leaves the grip to grapple, Brennus can easily push his sword downwards and threaten him with the tip pointed to the face.
Where is the time delay between your character raising his sword to parry the attack (which obviously has to happen at the point where Brennus' move is completed) and then relinquishing a hand on his sword to reach out and grab Brennus' wrist? Are you saying your grab is faster than Brennus' back-step and pulling his arm back? I don't see how that's possible unless Florian has supernatural speed. Or are you taking an additional step forward after the parry? In which case they are matched in action, so it must be that Florian is just faster for some reason, as he has to cover that distance where-as Brennus just has to extend it. (all of this is in response to the idea that the grab is inevitable)
Brennus could push himself back with his right leg the instant before Florian's grapple connects
However, you have yet to address the fact that as soon as Florian's hand leaves the grip to grapple, Brennus can easily push his sword downwards and threaten him with the tip pointed to the face.
I don't think he can do that, due to the way he's parried. This could work even if Florian parried with one arm: Brennus' weak is firmly against Florian's strong. Florian's sword is horizontal, tip to the left, while Brennus' attack is a straight lunge. Even with six hands, he couldn't push down on that.
It occurred to me another thing Florian could do here, as he has complete control over Brennus' blade, is shift his sword so the tip faces Brennus. This pushes Brennus' blade away and lets Florian stab him unimpeded.
<Snipped quote by Sathanas Rex>
I tested it. Thanks to having a two-handed grip, Brennus can push downwards the hand closer to the hilt, while pulling up with the other, creating a very forceful push, capable of simply bending Florian's elbow and forcing away his shoulder.
I tested the range from seven feet away with an 85 centimeter sword, you still have to fully extend to hit. You can recover from that certainly, maybe more easily than what I had first thought, but we've already established this.
Also @Vordak, I see what you mean with the push, but I think that he can't muster that kind of force, due to his arms being almost fully extended because of the strike and his chest also totally forward. There's not a lot he can leverage, right? It is true that it's not exactly weak on strong any more, I'll give you that, but Brennus is still in too uncomfortable of a position to really push down.
A vertical cut in gran passata, moving your right foot forward. It's not a straight lunge but something like a downwards hack, lunging forward with your body. If you split that movement into two then yes, it's different, but in this hypothetical it's a continuous attack.
This is rather fun though, I have to admit.
Skallagrim, I don't quite understand how else you would lunge? It certainly wasn't described as a particular kind of lunge.
Instead, Brennus launched a fairly simple attack, stepping forward on his right foot to grant himself extra reach as he lifted his weapon slightly and pushed down with his forward hand,