 So far, the replies to the reductio have been “combative” in that they seek to undermine some tacit or explicit premise therein. Yet other responses are “concessive” in that they admit that the reductio has a point. One concessive response is to reject EXT in light of the reductio, though as we saw in section 1, EXT has its own arguments to contend with. But a different concession, considered in this section, is to forgo SK. (There is also a “quasi-concessive” response, considered in section 2.5, where the apriority of (3) is simply embraced rather than rejected as absurd.)