Enough time went by between when Micha hit the water and Samantha got to the shore that the surface of the lake was calming, the only sign anything had happened were ripples still spreading out to the edges.
The impact with the water had scrambled her wits (not to mention it had hurt!) and the mermaid sank to the bottom before starting to collect herself. Reaching out for the Force she calmed herself and took a few seconds to release the pain before pushing off and swimming up to the surface.
She'd sensed the other person's arrival but hadn't met them before, and made sure to be facing in the woman's direction when her head broke the surface. "Hello, I'm sorry to have startled you."