If that's the case, it's still a bad ad for Walther. You can have all kinds of situations, and the right weapon will work if you are hanging upside down or laying on the ground or fighting dogs with it. This one failed. There are a few complaints on forums, but I have no personal opinion on its reliability.
The gsmith at our local gun shop said any self loader is prone to not fully eject the shell if it is not held properly.