Just Greeting
Melissa wants you to know that she is uninterested in your dull small talk and would prefer to stop any conversation with a pleasant nod and go on. She isn’t trying to be impolite; she simply wants you to know that chatting to you is too much for her.
This person, on the other hand, understood your message loud and clear. There’s no need for small talk; in fact, if you’re seeking easy gestures to employ in the corridors, he’s got you covered. While we despise awkward small talk, we despise Melissa even more today.