The application of invention patents and new patents has three characteristics: novelty, practicality and innovation.
Not fitting the terminal is just a funny plot of the movie, which is a joke of the writer or director. Of course, it is impossible for divergent terminals to apply for patents.
Practically speaking, the combination of nail and sword has no special effect and is not practical enough.
As far as freshness is concerned, there are all swords with thorns, and everyone knows it, so it is not fresh enough.
From the creative point of view, putting spikes on swords is not technological innovation, let alone creativity.
As long as one of the three is unreasonable, you cannot apply for a patent for invention or utility model.
If the shape of your sword or spike is novel and special, you can apply for a patent for shape design.