17. Fire can be seen caught on multiple floors after went up along the safety net. Given most people closes their windows, the fire is more likely to be caught by the foam outside the windows and building materials on the stairways.
18. According to building safety guidelines, the safety nets are supposed to be made in fire suppressing materials, which are clearly not what we saw. It is reported that the flamable ones are around half as cheap as the fire suppressing ones.