Framer, with a time restrictive emergency. I do the P.A. first in a basic NITS format omitting technical language, then like Cosmo I call the cabin manager. When a real NITS is warranted I will ask the cabin manager if are they happy to repeat what they understood from the P.A. as a NITS back to me and I will add the specific information.
The way I see your problem is that you must have done very well in the sim if that is the check captian's only issue.