The pilots/jumpseaters threw the bags out while waiting to go out the only available exit. The video shows that the fire was quite intense - no one would have delayed egress just to save bags. Imagine how long it took 7 normally-abled people to shinny down a 25 foot rope.
And the only slide on the non-burning side was unuseable due to wind and the roll angle of the fuselage. The jumpseaters pulled the disconnect handle in a desperate attempt to get a normal deployment.