When Marceline and Kira left, Ronan was accompanied by Evelyn and Natasha to the emergency room. He also needed a doctor's treatment. His forehead and nose were bleeding after hitting the wall.
Ronan and Natasha were cursing Kira and Marceline. They didn't expect that Kira would not hesitate to hurt them even in a public place. They caught the attention of other health workers and patients.
But they saw how Natasha charged in Marceline's direction, dragging her. She tried to slap her but Kira was there to stop her. So the people who witnessed the scene couldn't blame Kira as Natasha was the first one who made a scene, creating a ruckus.
She was also shouting. Her loud voice was disturbing the other people. So instead of giving them pity, they felt annoyed towards Natasha and Ronan. They were the ones who started the commotion.