Their breaths together feed someone whom we do not know.

他俩的呼吸共同为某个我们所不识的人提供养分。

To feed someone something just means give it to him.

喂某人某物就意味着把它给他。

Sean knows how to feed someone who's improvising, knows, you know, which way to direct them.

肖恩知道如何满足即兴创作的人，知道，你知道，以何种方式指导他们。