If the leftmost crystal is dropped, it triggers the magic wall (as usual), but also causes elements sitting directly on top of the wall to fall through. This should not happen in DC2 (or at least, it doesn't while playing DC3).
Elements don't fall through using the EM engine, but will if using the RnD engine. To my memory, elements won't fall through if sitting on a magic wall in EM levels. I haven't been able to find a readily-accessible magic wall to test yet.
