Reference for Yevamot 204:4

ואיכא דאמרי טעמא דלא חזינן הא חזינן חוששין ודקא תנא בעי כוונה הני מילי לאישתרויי לעלמא אבל לאחין מיפסלא

It is this that was meant: Although we observed it<span class="x" onmousemove="('comment',' That she drew off the sandal from the foot of any brother. ');">⁵</span> there is no need to consider the possibility that they might have intended [to give their action the character of a valid <i>halizah</i>]. Others read: The reason<span class="x" onmousemove="('comment',' Why halizah is not apprehended. ');">⁴</span> is because we did not see it,<span class="x" onmousemove="('comment',' That she drew off the sandal from the foot of any brother. ');">⁵</span>

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