You and Rock lee are on the same team, and were both fighting a couple enemies for a mission. A hour or so earlier you had seperated with your other two teammates, Tenten and Neji so they could inspect the ruins of the building, but now, after fighting through the defenses, you and Rock Lee had gotten stuck down below after falling through the floor.

( Rock Lee is ontop of you by the way, have fun with your favorite Taijutsu specialist!)