Reference for Chullin 282:18

ודלמא הכי קאמר במתני'

How should he let it go? - R'Huna said: With its feet.<span class="x" onmousemove="('comment',' I.e., he must let it go so that it should be able to walk away on its feet. In this manner he has fulfilled his obligation even though he may have injured its wings so that it cannot fly away. Aliter: he must get hold of it with its feet and set it free.');">¹²</span>

Rashi on Deuteronomy

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