The plane bounced 3 times and the flames erupted on the second or third bounce: https://www.youtube.com/watch?v=t9_xh7aK2No

I don't know what video you are referring to, but the ones I've seen from the inside look like the plane is taxiing after the third bounce, which likely caused the fuel leak and the whole fire.

Grabbing bags is stupid, here in this case people died for a different reason.