Different airlines have different procedures with respect to when the after landing checks are commenced. It is quite feasible that, assuming the aircraft was going to clearly vacate at the far end of the runway, the aircraft would be down to taxi speed (circa 20kts) well before the end of the runway in which case the checks (which include retracting flaps) could be initiated then.
With other operators the procedure is not to initiate the after landing checks until the runway has been vacated. It obviously takes a little time for the flaps and slats to retract but I see nothing sinister in the fact that they are retracted - all normal operation.
If the landing had been performed with no slats (a possible failure but extremely unlikely as there is more than one way of deploying slats via standby hydraulics) this would be a "non normal" situation requiring running of the non normal checks etc together with most probably (once again depends on individual airline policy) an emergency declared.
Last edited by fireflybob; 21st Sep 2012 at 18:59.