Tears in his eyes, Mohammed al-Sabbagh shouts into a mobile phone, imploring his niece on the other end to “be strong” as she languishes under rubble in Gaza. The call was made near the start of a three-day ordeal for the girl, 15-year-old Hala Hazem Hamada, who was finally rescued on Tuesday after a deadly encounter with Israeli soldiers that claimed the lives of six relatives including her parents and sister. The bloodshed began on Saturday when Israeli troops descended on the residential complex where Hala’s family, originally from northern Gaza, had sought refuge outside the territory’s so…