That’s one account of the gun fight. Here is another from CNN..
”The chaos continued on Monday morning, when sniper fire killed a member of the Afghan security forces helping secure the base, one source told CNN. The affiliation of the sniper was unclear, the source said.
In the confusion, Afghan forces returned fire, but in the direction of some US Marines, who opened fire themselves, injuring four Afghans, the source said.
The four are in stable condition and there were no US casualties.”…..