The problem with that is that I don't think that will get you very far... If emotion is pure energy flowing feely thru the body, a blood-curdling ki-ai *could* be what you're looking for, however the harmony of yin/yang cannot exist between the breath coz you'd be breathing out at that time.

The only 3 keys (pun intended) as it pertains to martial application are ten no ki, chi no ki, and jin no ki. Looking elsewhere, to me, would be a waste of time...