Reference for Bava Kamma 102:10

איבעיא להו בור תשעה ומהן טפח אחד מים מהו מי אמרינן כיון דלא נפישי מיא לית ביה הבלא או דלמא כיון דעמיק טפי אית ביה הבלא

About the statement that they would all be liable there is [on this supposition] no difficulty. And as for the other statement that the second digger would be liable, this refers to a case where e.g., the unhealthy air was sufficient neither to kill nor to injure, and it was the other person who by diminishing the size of the pit increased the dangerous effect of the air so as to make it capable of both killing and injuring.<span class="x" onmousemove="('comment',' In which case it stands to reason that the second person only should be liable. ');">⁸</span>

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