Originally Posted by
procede
Carbon fibre is to brittle to really slow down a bullit, so there is probably also a hole in the pressure vessel underneath, unless the bullit hit something else first, like the AC packs.
A hole this size shouldn't really be an issue in any case. Especilly if you reduce the cabin altitude during flight.
Brittleness is only a characteristic after you expend the energy during impact (either it gets stopped or penetrates through). I do like the crack stopping ability of carbon fibre though