After Harvey managed to deduce Dan's aim and plan, he then started to think about saving Tina. It was not because Tina was important, but it was simply because after saving her, it would immediately destroy Dan and Coco's perfect plan and disgust them.
Harvey believed that if he kept on destroying Dan's plans, no matter how tough he was, he would eventually break down. That was why Harvey had already asked Alexei to send people to keep an eye on Tina, resulting in that scene just now.
Most imp