Well, if the pilots are indeed trained on how to handle these situations, the passengers will be fine. Maybe a bit shaken up from having to evacuate on the tarmac (especially if they have a fear of flying), but they'll be fine.
based on the photos, they did pop the slides on this incident. but evacuations are often not called in these situations if there isn't a fire or something.
there's a real risk of injury from evacuating, so it needs consideration by the pilot.