With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: His explosive temper probably provoked the disastrous siege of Fallujah last spring , killing 600 Iraqis , most of them women and children , in revenge for the deaths of 4 civilian mercenaries , one of them a South African .
text_B: The killing did not happen
not-entailed.