And that'll snap it off the seal's neck.

这会把它从海豹的脖子上扯下来。

I put it on her face for a moment, then snapped it off.

我把它放在她的脸上一会儿， 然后把它摘下来。

You're gonna take the end of it and give it a full two turn twist, being careful not to snap it off from the center, and giving it a good twist so that you'll see you'll have some dimension to it.

你要把它的末端拧一整圈，小心不要从中心折断，好好扭转一下，这样你就会看到它有一定的尺寸。