[Expy]

I don't want to presume, but you are aware of the difference between 'Sacrificial Dodge' and 'Sacrificial Dodge and Drop', yes?

Side note, while Sacrificial Dodge and Drop doesn't specify that each parties weight should be considered, you should probably use the 'knock over' value and compare vs the target, unless you like the idea of pixies sacrificially dodging for ogres. I do, but it's a matter of taste.

As to the rest, I wouldn't model that as a defense but rather some sort of All-out-Attack (Double) Grapple and Pin to drag the target to safety -- a bit too involved for an active defense, I think.