Actually, cockroaches aren't really flying, this is essentially a cultivator's technique of Qi Manipulation flying, or to be more precise, it's on the foundation of traditional Qi Manipulation, adding a layer of Thunder Escape electromagnetic acceleration magic, simulating an anode-layer Hall thruster.
As is well known, Hall thrusters use hydrogen, argon, and xenon as propellants, but they do not generate thrust through combustion, instead, through the Hall effect. The propellant gets ionized by electron impacts, is accelerated by an electric field, and then neutralizes the ions in the plume, ultimately forming a plasma plume for thrust.
And the space flight of this cockroach fairy clothes follows exactly the same principle.
