Regulus - 3, Marlene - 1
Regulus wasn't impressed with the birds. Like he told Remus he was always expecting the worst and he reached for his wand the moment he saw heard the noise. Getting up from his lounger, he surveyed the scene. It was much easier to battle other people, but there was no way he could predict a bird. He certainly couldn't predict the fire coming from the little bird and Scorpius screams. The chaos that ensued was more predictable.
He probably could have gotten out of here, but there were too many people who had no idea what to do and while he was no Gryffindor, there was one person who definitely needed to be protected: their healer.
Regulus saw the bird go toward Marlene and he cast a blasting hex. The bird seemed to sense it and veered, but still got partial hurt. The loud response got the other birds into a frenzy and two went toward Regulus. He tried to run, but the floor was slippery and there was no Apparition here. Regulus managed to hex one of the birds, but then fell as he tried to avoid the second one. He banged his head, but he couldn't let that stop him. He kept hexing and moving. He ended up cutting himself against the corner of a metal table, but he couldn't stop. "McKinnon, come on, we need to get you out of here." People could find their way to the infirmary, for now, he'd have to get her there. His injuries could wait until they were safe.