The D.I. put the rifle down butt first on the ground and used his foot to open the action. His boot slipped off the slide handle, making the rifle lean toward him and the weapon fired killing him instantly, then the rifle doubled and the other shot hit and killed the recruit he was helping.
Jeeezz,
All it takes is a moment of Not Thinking. Sad ordeal..
Dave,
I believe Firstflabn was probably referring to the carbine slide.
It's my fault, I'm the one that got this Off Topic from where the OP was heading.