Is it possible that this thing happened:
The moment Werner is about to shoot the goalkeeper shouts at him something like "boommmm".
Werner is scared - he misses the chance.
This is what happened to me once:
I 'm in the army with a rifle shooting detail.
When I took position the trainer in sweet voice says to me "oooh, it's my dear friend, welcome, welcome". I take the rifle, place the cartridge in, was about to take aiming position when all of a sudden he starts yelling at me like a madman. Result: I drop the rifle on the floor !
Now this was part of the drill it seems so that's why he acted like that.