His upturned hands paired with another slight shrug suggest that it's still all up to her to decide for herself. He won't fault her for having different opinions, and neither does he fault her for being cautious.

As Merrin turns her attention to the other device on the table, Cal smiles a little. "Tony asked me to help figure out some kind of power source for a project. I thought having it shaped like this would help the energy to circulate more consistently." He carefully removes one of the crystal rods from it, holding it out. "These are what the Agrii had around here as a power source. They're rechargeable."