Place it at the start of a scene, just before the action begins, then follow it with Awkward Moment when the group hesitates again. For an anime reaction edit, open with Anime Ahh and let this clip answer it.
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This is a short Mikan voice line lasting about five seconds, with her soft, hesitant voice delivering the line about being told to begin. It carries a nervous, uncertain feeling, as if she is checking whether everyone really means to start now. The delivery makes it feel small and anxious rather than confident, which is why it works as a worried reaction.