Ki Form (Monk Focus Spell) corona emanation duration

[Lucas Yew]

If you use the 1 action to spread the damaging corona, what's the duration of the extension? Is it until the 1 min total duration of the spell, being some sort of a choice of whether making it unsafe for your allies to fight together?

[mrspaghetti]

Lucas Yew wrote:

If you use the 1 action to spread the damaging corona, what's the duration of the extension? Is it until the 1 min total duration of the spell, being some sort of a choice of whether making it unsafe for your allies to fight together?

Quote:

As a single action, which has the concentrate trait, you can flare your corona out to become a 30-foot emanation.

Use of the word "flare" indicates to me that it is an instantaneous effect. So I'd say it lasts only through that one action.