If you are seriously injured after a slip incident, then call for emergency medical responders. People who have been in slip and fall should try to stay still if they are experiencing pain when moving or breathing.
If you have been hurt, but your injuries permit you to move around, then you should use your phone to get pictures and videos of the scene. The evidence you collect can be used for an incident report and help you get one step closer to recovering compensation from the negligent party’s insurance company.