OK, the thigh is a good target for a sword-cut so that definitely counts against Gigue in this case. If the sword had hit Gigue in the waist coupled with his body weight, armour and momentum I would have expected a gouging cut of some moderate severity and then Sigurd's sword would fold back on itself and probably fly out of his hand or hurt his wrist or w/e. However hitting the thigh I can see it cutting and then slipping, making more of a mess in general, it could even severe an artery (my human biology is pretty shit, I know the main femoral artery is on the inside of the leg but I think it has some branches on the outside.)
However in our immediate circumstances Gigue only needs one of his legs, so it might not matter that much if he suffers a wound to his left leg.
So, my compromise is Gigue suffers a moderate bleeding wound to his leg which is stifled somewhat by his close fitting armour, Sigurd's sword either flies out of his hand or gets sandwiched between the two of them and he suffers a sprained wrist (Sigurd wears an iron chest plate so it wouldn't really do anything to him) the rest of Gigue's move can go ahead as he wishes (with his kicks and whatnot) but bear in mind Sigurd's left arm is over his torso so it won't be a clean rib crushing ass-slam of epic proportion. In either scenario Sigurd's right arm will be in the way of a kick (presumably with the right leg, as the left would be injured), but Gigue is strong enough to probably fuck up Sigurd's arm when he blocks with it anyway.
End result, Gigue has a wound that impairs his mobility and potentially bleeds him a little (though not likely to be fatal) so perhaps a two inch deep but very messy gouging wound on his thigh. Sigurd either loses his sword or it gets sandwiched and sprains his wrist (not to mention he will take whatever damage is incurred from the ass slam in my next post.)
Seem fair? If not we can always just have Pollen judge how much damage the cut incurs.