Zero didn't want to admit it but he did enjoy the kiss on the cheek that was given to him. Well his facial expression didn't show much excitement but he was pretty happy. He decided to push his human feelings aside for now and continue on with the mission. Zero was gonna simply wipe out all the citizens near him and 13 but it looked like she was having fun and he didn't won't to ruin that. 

He spectated her actions having a smile on his face the whole time the scene played out before him. Its like person after person was asking to be killed. The cops approaching the scene made the show even better. Its like the day played into his favor when Anastasia was shot and was attended to by another citizen planning to end their life. He knew there was only a few more seconds until 13 will be back so he decided to set the mood of her revival.

With another slight wave of his hand all the cop cars besides the one with the man who shot Anastasia combusted leaving a great amount of destruction in the streets. Some citizens ran while others tried there best to get Zero on tape. Zero looked at the cop. "She's gonna be back and when she comes to I want you to look handsome for her okay." Zero said smiling as a few more cars exploded due to the fires from the destroyed police vehicles spreading. The officer was safe inside the center of this destruction for now that is until Anastasia awakens.