What is it called when a poem ends with an unexpected twist?

Question

I think there is a term for this.
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Example:
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"We are earth's best, that learnt her lesson here.
Life is our cry. We have kept the faith!" we said...
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Proud we were,
And laughed, that had such brave true things to say,
- And then you suddenly cried, and turned away.
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(Rupert Brooke, "The Hill")

Answer 1

dramatic irony. I might be wrong about the dramatic part, but I'm sure about the irony part.

Answer 2

Hmmm, I know it isn't dramatic irony. Dramatic irony is when we (the readers, or the viewers of a play) know something that one of the characters does not know. For example, in "Romeo and Juliet", we know Juliet is just sleeping off the potion, but Romeo thinks she is dead, and acts accordingly.

I know that what you are talking about makes the whole poem ironic, but I am not sure what the technical term for that "twist" is. I know it's a rhetorical device, but I don't know the name.

Sorry to be of no help ;(

Answer 3

I don't think there's technically a trope that is designated specifically to that. When the exact opposite of what we expect happens, that is irony. But I think it's part of the nature of a poem's ending to delight us at the end and sometimes that is with an unexpected twist.