There's a guard on the second floor working with us.
二楼有个守卫是我们的人。
英语百科
Floorwork
In dance, floorwork refers to movements performed on the floor. Floorwork is used extensively in modern dance, particularly Graham technique and Hawkins technique, as well as in vernacular breakdancing. Some dance training practices, notably Floor-Barre, consist entirely of floorwork.