Planes land following massive airstrikes against the Germans in Sable-Sur-Sarthe, France, in World War II

The video tutorial provides an overview of a base, highlighting the ground players tracing the runway. It marks the start of nighttime activities and describes the massive silhouettes of the Royal Air Force, focusing on the injured personnel.

What might 'traced the runway' indicate about the preparation for the night's activities?

How does the text suggest the relationship between activity and injury?