If a whole wing and engine is on fire , not just smoking a little but great big flames that can be seen a mile away is not enough to evacuate then what is?
Wait till the wing actually explodes?
Raise your hand if you think any of these airlines (just to name a very few) in their home countries would NOT evacuate in this instance:
1. Lufthansa in Germany.
2. United Airlines in the USA.
3. British Airways in the UK.
4. Air France in France.
5. Japan Airlines in Japan.
6. Delta in the USA.
7. Southwest in the USA.
Just to name a few airlines that are as big as SQ.