The wall of elves is not exactly solid, but then, a wall of elves doesn't have to be.

Two of those between Bella and Celo start toward him with deceptive elven speed. He saunters backward with his hands clasped carelessly behind his back, then at the last second brings them forward again holding paired daggers. One finds a throat, the other a stomach.

There is a moment of stunned silence before all the remaining elves rush him in a shrieking mob.