What happens to the cards in a section of your capital which just got destroyed (burned)?

By Dainank, in Warhammer Invasion Rules Questions

What happens to the cards in a section of your capital which just got destroyed (burned)?

I never actually understood what happens with the cards, do they go back to your hand, to the discard pile or simply stay in the zone? could someone please tell me.

Thank You!

Basically, nothing happens. They just remain there.