Ohmygod wait jumping in here with the perception stuff.

There was an earlier answer that if a marked character threw water at the force field it would splash back. If they threw their food at it would it be the same?

And how would that look? If an unmarked character saw it go through, would it just stay where they saw it land, because it's inanimate? Or would it eventually.. not be outside the cell anymore?

Or would their perception take away all the fun and show it thrown directly at the spot the marked character sees it land?

If they'd see the marked character walk out of their cell to retrieve it, instead, I'm going to cry.