[ Wolfram stays silent for a brief moment himself. There is something Wolfram doesn't like about Axel's silence and hesitation, which needless to say he noticed, but for now he won't say anything about it. If Axel wants to speak about Mars he will do it when he feels like it.
In the meanwhile, as he waits for a possible further explanation, Wolfram brings up a hand to softly try to pat Mars' head. ] Look, he is happy to see you.