Erik follows hesitantly, though, whatever Fury's talking about, he's interested.

When the case opens, Erik looks down at whatever is causing the glow. What he sees is a cube, blue and glowing with some internal light. Sparks flicker through it, as if caught in a thunderstorm made solid.

The clear security measures placed around the cube, notably the keypad, which presumably requires a specific code to release the cube, make Erik wonder.

"What is it?" he asks, looking back up at Fury.