to scatter, to expel, to crack, to split, to jump
逬 centers on sudden, forceful outward movement: scattering, expelling, cracking, splitting, or jumping. The common thread is something bursting or being driven apart.
逬 combines 辶 (movement) with 幷, which likely contributes the sound and the idea of splitting or bursting. The exact historical development is uncertain.
The movement radical 辶 wraps around 幷, which looks like two halves being forced apart. Picture something moving outward and bursting into pieces.
For ホウ, imagine a loud 'how' of wind scattering leaves: how -> ホウ, as the wind expels them in all directions.