Seeing Katherine on the ground unconscious caused Damien to enter into protective mode as his mind quickly recalled what needs to be done in a medical emergency while he quickly went over to her. Despite his anger earlier, none of it mattered at the moment. All he wanted was to make sure she was okay.
"Katherine..." He carefully pulled her up and cradled her in his arms, gently patting her cheek to wake her up only to realize that she was having a fever. "You're burning up."
He immediately gathered her in his arms and carried her back into the building. On his way to find the exit back to the streets, he bumped into Styles and he told him what happened.
"I'm bringing her to the hospital," Damien said as he was on his way out, carrying Katherine in a bridal style.
"No! No hospitals. It's not safe there." Styles stopped him from getting out.
"She's sick! She needs a doctor!"