It is thus clear that adding an undercutter of this sort to the story changes the total evidence with respect to the claim in question. That is, in the case of typical undercutters, a metalevel claim filters down into the body of evidence in question precisely because an undercutter is a defeater and hence alters the total evidence with respect to the claim in question. There are two important differences between typical undercutters and the role of reflective ascent in the face of disagreement.