Fire Second Shot and Identify Malfunction

What happens here

The student fires the 9MM handgun for the second time. The handgun discharges, but a malfunction occurs where the spent casing fails to properly eject, causing the slide to be partially open and potentially jamming the next round. The student again reacts strongly to the recoil, grimacing. The instructor immediately identifies the malfunction ("Something jammed, it didn't eject the shell").

Goal: Successfully fire a second round, experience recoil, and recognize a firearm malfunction.