Bucky's demon fruit is a kind of divided fruit. The ability of a torn fruit is to split the body. From the battle above, Hawkeye cut Bucky into pieces with a black knife at night, and then, as Red Hair said before, Bucky has a body that won't die no matter how many pieces it is cut into. Bucky's ability is not afraid of chopping. Even if he covers the blade domineering, he can't do any harm to Bucky's body.
Speaking of birdcages, this is a trick that Dover Longminger used in Dresden.
Bird cage is Ming Ge's ability to use string fruit, which makes countless silk threads erupt into the sky of the city like a volcanic eruption, and then countless silk threads will fall to the ground like a meteor at one o'clock, expanding into an arc-shaped huge bird cage. The birdcage itself consists of countless silk threads, which are extremely sharp and have strong cutting ability. Whether it is human skin or scattered buildings, it will be cut by the silk thread contracted by the birdcage. Although the birdcage is Ming Ge's last resort, Ming Ge is absolutely confident that no one can escape from the birdcage.
In addition to sharp cutting ability, birdcage also has the ability to shield wireless signals. The former is the conventional ability of birdcage, while the latter is a bit metaphysical. Why do birdcages with large line spacing in animations and cartoons have the ability to block wireless signals? This can only be said to be the inherent ability of the fruit, so Ming Ge is full of confidence in his birdcage, but let anyone in the birdcage go.
But at that time, brother Ming had to deal with many things, especially fighting with Luffy, and his body should always be domineering. So a birdcage that can cover the size of a city is obviously impossible for Ming Ge to provide domineering. Besides, Brother Ming is too small to support the domineering consumption of birdcages. Bird cages can only be driven by the ability to operate independently.
But that means that birdcages can't really trap those innate and special superhuman abilities. Natural ability can talk about the body, special superhuman ability, such as Baki who can split, can also split the body through a birdcage.
Even if the bird cage is covered with domineering, I am afraid it can't stop the innate special superhuman ability. There are some myths after domineering. Domineering can only grasp the entities of the natural department and increase the attack power. Domineering is powerless to the interesting elementalization of natural systems and the unique ability of fruits. Bucky's ability is that he is not afraid of splitting, even if he is domineering, not to mention a birdcage composed of lines.