During a power outage, should a hotel with darkened halls and stairways provide staff to help guests safely find their way with flashlights?

Sadly, if a hotel were to assist a guest and the guest got
injured, the hotel would be liable.  The hotel cannot be found liable for a power
failure that is no fault of their own, as long as they have the appropriate emergency
lighting in place that runs on a battery backup.  If the power is out longer than the
battery on the emergency lighting lasts, the hotel still cannot usually be held
liable.

It's very sad how litigious our society has
become.  More companies have stopped offering convenience services for fear of being
sued by disgruntled customers and/or employees.

Back to the
case at hand, as the previous answer explained, if the facility has an emergency plan in
place, and the employees follow the plan to the letter, their liability may be limited. 
However, if an employee decides to do something that isn't listed as part of that
procedure, and something goes wrong, the company and the employee may end up being
liable for damages.