Reference for Bava Batra 118:8

<big><strong>גמ׳</strong></big> מאי איריא לחצר השותפין אפילו לחצר חבירו נמי לא

the case [according to Rab Judah] is different because the owner of the roof can say to the other: I cannot actually do anything on this spar. All I can do with it is to hang things on it. When I do that, I will turn my face away. And the other [R. Huna]? — [He can rejoin that] the other may say to him: You may become afraid [of falling, and not turn your face away].<span class="x" onmousemove="('comment',' And so overlook my courtyard. ');">⁷</span>

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