With one eye closed, he drew the cord back, preparing to shoot.

他闭着一只眼睛， 拉回绳子，准备开枪。

He closed one eye and pulled the cord back as if he were going to shoot.

他闭上一只眼睛， 把绳子拉回来， 好像要开枪似的。

So the resident switches with a nurse to kinda have their finger in there to hold the cord back.

因此，住院医生换了一位护士，让他们的手指伸进去拉住脐带。