Who said it acted like a diode?It’s the only technical non voodoo’ist explanation, if they (fuses or cables) are seen/heard to be directional.
But I'm sure Geoff will pull another rabbit out of his hat.
https://static.guim.co.uk/sys-images/Books/Pix/pictures/2009/12/16/1260957295386/Magician-pulling-a-rabbit-001.jpg
Cheers George