Can 一つ be used as a motivation or pump-up phrase, like a kiai?


In the _Rockman X4_ manga, the Reploid military of the Repliforce rebels
against humanity for independence after being falsely suspected of involvement
in a city's destruction and ordered to turn in their weapons, with Jet
Stingray being one of the Repliforce sub-commanders leading the rebellion.

One of the Maverick Hunters, Zero, battles him at sea after he destroys a
city, and manages to slice off Stingray's helmet. Stingray compliments him and
says he likes fighting strong opponents and that the Repliforce Colonel taught
him to be ready to step into danger at any moment.

(This is the specific page I'm referring to about with regards to usage of
一つ):
<https://www.facebook.com/justbeamegaman/photos/a.1082047715222991/1082050911889338>

He says 一つ at the beginning of all of his remarks to Zero in this instance. I
know it normally means "one" or "once" or "only", but from the context here it
looks like he is randomly saying it as a motivation shout, a _kiai_ , similar
to how one can shout "Geronimo!" in English as a motivation phrase, or
"Chesuto!" in Japanese.

Is it normal for 一つ to be shouted in this manner, and can it be randomly
shouted to signal excitement or motivation?




This is enumeration.

In English we most commonly use ordinal numbers and say "first/firstly",
"second/secondly", "third/thirdly", "last/finally", or we could also use
cardinal numbers, "One,...; two,...." In Japanese informal language, it goes,
一つ... 一つ...

I took a quick look at your manga page. One fighter is telling the opponent
what they should do/think, based on someone else's teachings. "First, be happy
that you get to meet strong opponents; second, don't think you can't beat the
opponent and hope to retreat; third, in death find you way to life..." (really
rough rendering, since your question is not about the meaning of the lines)

