Inductance (magnetic field) built up in the battery wires (Just like in a motor) creates a voltage spike when collapses. So when disconnecting there’s a high voltage for a fraction of a second. On the motor side of the esc it’s not a problem for some reason
And the shape of the wires also effects how much inductance is produced. With battery wires that have both black and red as close as possible i think reduces both the inductance and also possible radio interference it can produce.
Tell me if I’m wrong someone.