Considering how the residence he, Yuuki, and Ai shared now included Yuuki's father, and at times Yuu and Mika, Zero had to replenish the kitchen even more so. Not that he minded. So, like usual, the cart he's pushing is very full.
The only difference with today is how badly he needed a distraction. Yesterday he learned he had a son (even if from very far into his own future), and now he was suddenly gone again? It wasn't fair.
He certainly does recognize Martha upon seeing her. Even more immediate is being able to tell she's definitely human. He's almost about to just not say anything, actually feeling bad about the other day- even if at that moment it was only to protect others.
"I see you're back to your usual self." It wasn't a question. Nor was he speaking harshly.