There isn't anything else on the ground, but the laptop is on the ground next to a row of lockers, and if either of them look on top of the locker right next to it, they'll see that there's a clear rectangle where there is less dust than the rest of the space on top of the lockers, a set of pawprints leading towards the rectangle, and another set of pawprints that are less clear and more smeared that lead away from it.