"he shall be put to death": by strangulation. You say by strangulation, but perhaps by one of the (other) deaths mentioned in the Torah? Would you say that? This is a principle in the Torah: Any (unqualified) "death" mentioned in the Torah — you are not permitted to incline it to severity, but to lenity. These are the words of R. Yehoshiyah. R. Yonathan says: Not because it is of lesser severity, but because all "death" unqualified is strangulation.