<div>That one must make quick calculations is evidenced by the fact that if he can save the Nirdaf B;Echad MeiEivarav of the Rodef, and he does not do so, killing him instead, he is a Shofech Damim.</div>
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<div>All of the objections to the particulars of the case are sidestepping the primary point. It may take some back and forth to fine tune precisely the case, but I'm pretty certain I could do it.</div>