No time available, direct serious threat to occupants (you are scared for own life) - Evacuate
Some time available, potential threat to occupants (a tad worried about what could happen) - Precautionary
Time available (not worried at all) - Normal disembarkation
Sadly there is no script it all comes down to your judgement and even a subtle change in your circumstances can change the "best decision" but all I can tell you is "any decision beats no decision at all"