Escaping a double check
The answer to Is it possible to block a double check? says
Moving the king is the only way to escape a double check. There is no possible other move that will block both checks.
But in the following situation, is it allowed for Black to escape by taking the Rook (placing White in check) and forcing a sacrifice of the Queen? If not, why not?
Black to move. Never mind how it got to this position, it's for illustration.