from the product thread, the designer chimed in
Jeremy Smith wrote:
So, uh... I wrote that a while back and looking at my notes... I believe I intended that the Fort save would block the limb from being removed, but you'd still suffer full damage... but I might have also intended it to reduce the damage, but not the limb removal. I'm PRETTY sure it was to block the limb from being removed, but I'm not 100% sure.
That's a mixup on my part for not putting that explanation in there, but I don't want to claim official ruling on that.
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