User blog comment:LucidPigeons/Category Cleanup/@comment-2059440-20160301040902/@comment-366087-20160307201604

"Dissonant Serenity" is not a recognized clinical term. Sounds like TVT terminology.

IF there is a need to have something like it, "Calm under fire" is perhaps the closest to what it seems to mean. Although a person can be calm under fire yet excitable and or lose their chit in other situations.