He's the one goading this reaction out of her on purpose, shouldn't apologizing be the natural course of action? He won't do it again right away, but he does rub small, careful circles against her back instead. Easy, now.

"I'm worried about you," both him and Kaito are! But right now, he's the only one here, so it's his responsibility to make sure she's okay. "Even if you say it isn't bad, this is..." he casts a quick glance down to the puddle of petals at her feet, "This is a lot"