Reference for Bava Kamma 20:1

אי דבלאו איהו לא אזלא פשיטא אלא דבלאו איהו אזלא מאי קא עביד

If without his co-operation the fire would not have spread, is it not obvious [that he is totally to blame]? If [on the other hand] even without his co-operation the fire would have spread, what, if anything at all, has he perpetrated?

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