I've got it, but we should work on a better solution for when everyone spreads out.

[Moving over to the wall, Raven places a hand against it, intoning softly "Azarath Metrion Zinthos". Dark energy swirls from her hand, to a portal on the wall. It looks just like a circle of darkness, but Raven turns to the rest of the group.]

I can phase through walls--if I hold this, you all should be able to just walk to the other side of the wall too.