With the hand that's on his belt, Gigue can slightly control how Sigurd falls, so while the throw would indeed apply a rightwards diagonal force, Gigue can correct it enough to have Sigurd land face downwards.

As for the blade, i mentioned that in the post:

[quote=Vordak]the sword slipping, its tip glancing off one of his ribs and screeching against the shoulderblade[/q46te}

So, that would be sliding down the back, not the front.