This is natural and every male gets attracted when they see the female, their eyes goes there. May be the female body structure attracts them.
Then the man who seems aged reach there, he keeps on staring at the girl. He is feeling heaven there and starts to imagine the moment with her. He imagines like he being hero saving that girl sinking in the river and then the girl gets faint and he carries her in the shoulder and takes her to the safe place and he took the water from her body than the girl gets conscious and looks at the man and the man opens his outer cloth and gives to the girl and she gave a big smile. As she gave the big smile he returns from the dream and starts crying.