This happened during the Toth and Zorn fight at Denova. =(
Just to clarify, you cannot Noble Sacrifice yourself to death. What happened to Kanz was that he used it until his health was low enough that either the spikes or one of the smashes from the raid boss may have finished him off.
Although in retrospect this story is pretty funny, I do feel bad that I am posting these stories about him. But, I wanted to give an explanation of how the next events occurred… here comes our first raid drama… stay tuned… 🙁