I'm gonna be one of those horrible armchair quarterbacks but having time to make a nice approach and landing, then taxi clear of runway and shutdown barring any other information I'd say an orderly deplaning via forward and aft airstairs would be called for. The potential for injury too great. If the threat was imminent would one not call evac on the runway?
In this situation I would not expect any ground crew to be willing to approach the aircraft with stairs - I don't blame them.
Evacuation may be the only way to get people off.