How does Mr. Keating respond to one slack poem?

You're asking about a specific scene in the movie "Dead Poets Society," but you haven't provided enough context to answer your question.

To help me understand what you're looking for, please tell me:

* Which slack poem are you referring to?

* What is the poem about?

* What is the context of the scene?

For example, are you asking about:

* The poem that Neil reads in class, which is about his desire to be an actor?

* The poem that Todd writes, which is about his struggles with conformity?

* A poem that one of the other students writes?

Once you provide me with more information, I can help you understand Mr. Keating's response to the poem in question.