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Today’s Daf Yomi Question:
Stepping on the creature while walking is muttar even according to Rebbi Yehuda, since the Rabbanan deferred their issur in a situation of Mazikin. Why don’t we say the same according to Rebbi Shimon; that the issur miderabanan (of Melacha she’ina tzericha legufa) is muttar in cases of Mazikin, thereby allowing killing any of them on sight?