What is the primary difference between takhalluṣ and intihāʾ?

Final Chapter: Excellence of Opening, Barāʿat al-Istihlāl, Transition and Conclusion

• Takhalluṣ belongs only to prose and endings only to poetry
• They are two names for one device
• A prelude is mandatory in endings and forbidden in transitions
• Takhalluṣ moves forward to a purpose; intihāʾ completes the discourse