Activating the hardware kill switches while the mouse/keyboard is “stuck” doesn’t fix it, the network adapter is removed as it should, while the webcam is usualy disconnected already, since I rarely use it. Qubes os detects the removal of usb devices but that is all that happens.
I think every time this happened I was connected to the internet so I can’t say for sure if this also happens while the usb network card is disconected (by the kill switch).