... Add can only stare at Genos' back. Did he seriously just walk away in the middle of a conversation?

That doesn't really stop Add from following, though... but on the other hand, there will be more opportunities to analyze Genos. Better opportunities. Ones that he should be preparing for.

He picks up the entire platter of minty chocolates and carries it over to an empty table. It's time to put his skills to the test and reverse-engineer a brownie recipe.