Another funny Barrierquestion

[Jackal]

Hi!

Can you place a barrier on top of a barrier? If so, will the overmost barrier crush to rubble when the undermost barrier is removed? If so, will the rubble remain after the father of the rubble's turn is over?

Jalalabad Jackal

[HeroComplex]

The Barrier tokens must all be placed in clear squares---no square which contains a figure, object or terrain feature.