It's good that a tiny group of police officers walked by, and they were able to see the president getting suffocated. Leo didn't let go of her neck and the officers came to stop the scene. Tina's skin was already turning blue, but Leo was motivated to kill her. Because of her, Zella brought danger to herself.
When Leo was being pushed back away, he tried to brush off everyone by pounching and punching them, but they were strong, too. Leo underestimated the power of police officers. His mind kept on thinking that he was much powerful than the rest of them. No, the situation was different now.
Tina coughed up, holding her knees, all bent down, and was close to throwing up.