The so-called 'bayonet' makes more sense as a 'stake,' as proposed, earlier, by Suzkat, to position and plant the butt, at different angles of inclination, than to be used as a defensive close-quarters weapon against man or beast. Too many other, more stable, options were available to a man who simply wanted a 'bayonet.'
Frog gigging and gators? Indeed... The work, on this piece, may be inventive in appearance, but it was completed and finished with considerable purpose, by a reasoning 19th C. mind. I'm doubtful it was an afterthought.
Having spent a considerable time, in the field, I can assure you that drawings made in dirt, with sticks, will suffice for design work, when napkins aren't available. And, regardless the period, I still think the common man put a sufficient value on his time and his available materials, not to waste them, both, indiscriminately.
We have abundant technology, but have lost our sense of getting actual work done.
We recognize and admire it today, as an art form, yet in it's proper context, this was a 19th. C. tool and it was expected to perform work.
But, you already knew that...