The Doctor felt some of the tension leach out of him at those words, though he wondered for a moment if the other him had someone to travel with him. At least, though, this version of Rose got out of it alive.
"'S good." He started walking again, the need to keep moving pushing him on. "'S not safe, traveling with me. Any me." He didn't know this other version of himself, but he felt safe enough making that assumption.