Responsa for Chullin 17:12

מאי קמ"ל

thrusting,<span class="x" onmousemove="('comment',' Heb. During the act of slaughtering the whole of the knife must be visible. If e.g., one thrust the knife into the side of the throat and thus cut the organs, the slaughtering would be invalid, since the knife would have been covered either by the organs or the skin of the throat. V. infra 32a. vnrdv');">⁹</span>

Shut min haShamayim