Many a time, one's plans could never catch to the constant changes life would throw at them. Zhang Heng had to wait for the gunshots to stop before returning to where the first gunshot was fired. Doing that lowered his risk of getting killed significantly.
Unfortunately, something unexpected happened. The first batch of Soviet conscripts had returned, a lot earlier than he initially expected!
It was pointless to complain and wallow in regret right now, and all he could do was to crouch as low as possible and run for his life. There was no time to wait. He bolted!