Gareth felt the elbow aimed to his chest, and the hand that grabbed his wrist. There was no harm done, being that she was unarmed and he was in full leather gear (he had left his plate back at his makeshift camp.) However, it did surprise him. He was expecting a scream, or even a fight, and was prepared to knock her out with the pommel of his sword if she resisted, but what he didn't expect was for her to be so damned fast!
"Ugh, pain in my-" he cut himself off as he wheeled around, giving chase to her fleeing form. He could outrun her, he was confident, but she was raising quite a ruckus. There was only so far she could get in the palace before somebody heard her. Gareth needed to be fast. Luckily, he was as quick to think as he was on his feet. He'd brought a belt of small knives, just four of them strapped to his waist. He would need to be careful, but if he could aim his shots just right... while he was running, no less...
His first throw sailed wide over her head. He would be surprised if she even noticed it, it was so poor a miss. But the second and third were much closer. The second throw had embedded itself slightly within one of the stone pillars that were spread through the hallway; the third knife landed right where he wanted, where the hem of her formal dress touched the floor. It wouldn't be a firm anchor by any means, but it might throw her off balance and slow her flight. He kept his fourth knife on his person just in case, but at least one of the knives had done their proper job. and if the princess was fearful at all of warning shots, she might even stop running entirely.
Well, maybe that last bit is too much to hope for.
The time for negotiations was probably past, so after he had confirmed the last hit, Gareth unsheathed his sword, and old and weathered affair, while closing the distance between himself and the princess. If she wouldn't bend to reason, she would have to bend to steel. And if she continued making noise, he would have to resort to unfortunate measures.