Al Jazeera journalists killed in Gaza again. Who will bear witness?

Five Al Jazeera journalists, including correspondents Anas al-Sharif and Mohammed Qreiqeh, were killed in an Israeli strike on a press tent in Gaza. They had lived the story they told, from hunger and displacement to the relentless bombardment. As Israel plans to seize Gaza City, what will the world lose without the ears and eyes who bore witness from inside?