Reference for Bava Kamma 55:4

ת"ש שור שעלה ע"ג חבירו להורגו ובא בעל התחתון ושמט את שלו ונפל עליון ומת פטור מאי לאו במועד דליכא פסידא

Come and hear: In the case of an ox throwing itself upon the back of another's ox so as to kill it, if the owner of the ox that was beneath arrived and extricated his ox so that the ox that was above dropped down and was killed, there is exemption. Now, does not this ruling apply to <i>Mu'ad</i><span class="x" onmousemove="('comment',' In which case the Court would order compensation in full. ');">³</span>

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