Concerned yes, it isn't misplaced. He doesn't think that Wade isn't capable, she wears sensible shoes for a start, but like with all his friends, he doesn't like the idea of them being in danger or at risk.

Making a shake of his head, mulling that thought over, he also thinks on her question, the difficulties and danger of punching holes in the fabric of realities to begin with, the calculations needed and the odds against finding another CVE into N-Space and not stumbling upon one by accident. And the argument he and Adric had had when the boy asked to return home and the Doctor had said no. "I know how to do it and it is phenomenally dangerous but... Possible. Although not from here. My TARDIS can only travel in space currently, and not through time."

Another shake of his head, putting thoughts of Adric aside, he steps back through the foliage to lead the exploration.

"So you have met doubles of your group. Have you met yourself?"