The New York Times reports for years, Iraqis have described running for cover, praying and watching family members die in the Nisour Square shooting. Now, in court testimony that continues this week, former Blackwater employees have offered the first public accounts of what it was like inside the security company’s trucks that day. In a courtroom at a federal courthouse here, the men confronted their onetime colleagues standing trial for a shooting that left 17 Iraqis dead. Over all, however, the Blackwater testimony provided mixed results for prosecutors. Murphy said he heard AK-47 gunfire, though he never saw anyone firing on the convoy. Frost said he was certain the convoy was under fire. Defense lawyers say the Blackwater guards were on edge during one of the war’s most dangerous periods. Through cross-examination of Murphy and Frost, the lawyers conveyed the war’s terror.