I finally figured out how to track window velocity, so I used user32.dll to forcefully unclick my mouse and shatter the UI as a "punishment".
(programming.dev)
It's because liquid glass has zero surface tension until it hits the user32.dll barrier. I haven't implemented 'viscosity' in the physics engine yet, so for now, the UI remains in a solid, shatter-prone state. Windows 11: The Glass Update.