What's wrong with the 2nd half of FMJ?

The only thing about FMJ is this scene.

In past 20+ years, have rewatched this scene many times over on VHS and then DVD and then Blu Ray.

How did he Lieutenant die?

He was standing behind the tank where then explosions happened, which I presume is from mortar fire since there was no whizzing sound of incoming artillery shells.

Skip forward to about 54 seconds.

I am actually surprised I've actually found this scene on YouTube.