While Gu Fan was doing everything he could to hold back Ning Qi, Du Jun and the others in the restaurant were also making plans. They decided to go all out, pretending there was too much stuff, and the hall could not accommodate it all. It was also tough to take inventory, so they gradually moved things out into the hallways.
They spotted it - a staircase that would presumably lead to the second floor, where Gu Ling had directed them.
Being outnumbered, Du Jun knew that the best way to save Lin Xi was to disrupt Qian Ying's spell casting. That was where Gu Ling came in. The others' task was to lure away the protective circle around Qian Ying.
Having watched the surveillance footage, Gu Ling already knew that Du Jun and the team were ready to strike at any moment. Thus, she stepped out of the monitoring room. Her sensitivity allowed her to be aware that there were no enemies outside, so she walked out easily.