martin never said that he wasn't a suitable donor - lenora stated that about herself. the subtitles probably were a bit confusing there…

the german part: No, that's plausible. How can they all be dead? I will sneak up on him and cut his throat. (laughter) (Nein das ist plausibel. Aber wie können sie alle tot sein? Ich werde mich an ihn ranschleichen und ihm die Kehle aufschlitzen.)