User blog comment:CNBA3/Tartarus' Army!/@comment-8153438-20131104054118/@comment-1359322-20131104150236

Well Natsu did show that he only needs to get a scent of a person once and he can remember than person, like how he remembered Ultear's smell after fighting her once in the Galuna Island arc. So who knows, Natsu may have remembered Minerva's smell after she deflected his attack.