Context: It was not immediate , but after a few minutes of him gazing and rhythmically wiping the window free of the fog his own warm breath caused , a familiar face , or rather , profile , walked past . Recognising him , Masuda tapped on the glass lightly with only the pads of his fingers . This however was enough to catch the person 's attention , as they looked up , gazed around confusedly for a moment before their gaze found the eyes of Masuda .

Question: What may happen after the person notices who it is ?
Options:
0. None of the above choices .
1. They smile .
2. They wave for the to go away .
3. They give them a mean look .
Answer: 1