Can you imagine a situation where you need a saw back bayonet? Mental.
This is a bayonet meant for engineers, artillerymen and pioneers. The saw cuts wood quite well, and even better if it's fixed to the rifle while you're sawing away. It does look rather terrifying.
I imagine anyone surrendering with such a weapon as the saw bayonet would risk being shot on sight though.
There is a well-known story from World War Two regarding this as the Germans had a saw-back seitengewehr - if the Allies caught a German soldier with a saw-back, he was shot on sight (or worse). Most Germans ground off the saw teeth, apparently.