Which would be an incredibly selfish thing to do. During an emergency vacate of an aircraft, ALL passengers are able to disembark within 90 seconds per FAA certifications. Six doors and slides are opened, it is not like a normal landing and all passengers file out one door to the jetway.
In my opinion, and every person who is an actual aviation professional, there is NO EXCUSE for grabbing your luggage after an accident like this, even if your bag cost $5000.
There are photos showing some passengers carrying 2 bags and more with them right after the slide. That would no doubt slow things down, the aisle is only so wide.
I only hope those people did such an incredibly selfish act through shock, and not selfishness and greed.
Or at least stay seated till the everyone else has had a chance to get out, then if it lights up you've only cooked yourself. In that type of situation there might not be a fire the moment the plane stops but the belly tank is underneath the wing spar, who knows if it's started leaking JP4 and is moments away from ignition..