Zhang Heng did not do anything harsh. All he did was knock his target out. After that, he said to Han Lu, who was standing in a daze, "Let's go."
And Han Lu quickly came back to reality as she had just woken up from a dream. She found out that she would get to know Zhang Heng better every time she contacted him. But in the end, Han Lu would realize that her understanding of him only scratched the tip of the iceberg.
There were too many secrets hidden within this man.
Every time Han Lu caught one of Zhang Heng's secrets, there would always be more secrets waiting for her to unravel. Han Lu even started to doubt whether anyone in this world could fully understand Zhang Heng. The floor that they were on was not too far away from the ground floor. Hence, the two managed to come downstairs pretty fast.
They still left the hotel through the side door, and Zhang Heng had to eliminate the three guards first.