As his body charged at the person who attacked him, Leo was thinking about what to do. He could have taken back the body at that time, but something stopped him.
He reached out his hand to his other personality because he wasn't willing to let go of it. That was a part of him that might have been out of control, but it defined who he was. He wasn't trying to change that but control it instead.
But because he hesitated and tried to go back to normal, he wasn't able to gain control over the body before his savage sense.
His primitive mind controlled his body and flew it straight toward the arrows. All of them missed or were caught by him. They were coming at him at full speed and were filled with power so he needed to coat his hand in aura.
As he got closer to the archer, the arrows were getting faster and faster. Even if his hands could still handle the force of the arrows, he was not fast enough to catch them. His only option was to create a shield.