You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Genghis_Khan

Context:
According to the Secret History, Temüjin again offered his friendship to Jamukha, asking him to return to his side. Temüjin had killed the men who betrayed Jamukha, stating that he did not want disloyal men in his army. Jamukha refused the offer of friendship and reunion, saying that there can only be one sun in the sky, and he asked for a noble death. The custom is to die without spilling blood, which is granted by breaking the back. Jamukha requested this form of death, despite the fact that in the past Jamukha had been known to have boiled his opponents' generals alive.

Question:
What form of death did Jamukha hope Temüjin would allow him? 

breaking the back