This was an assassination, neat and clean. After some careful investigation, Gu Shenwei had a rough picture of what had happened.
There were four main killers, perhaps with another one or two men waiting outside as lookouts, but the ones that did the deed were those four.
From behind the tent, the first killer shot a flying dagger which was collected and taken away later, leaving an indistinct crack. The people in the tent were startled and immediately understood that something was wrong.
Senior Shou was a man of much worldly wisdom but he was the first to panic in the face of death. He had slipped and left clear boot prints on the ground when he desperately ran to the door.