White-rumped shama courtship song

The video below shows the male singing his courtship song to the female shortly after the female was introduced into his aviary. They are both in breeding condition but she is wary of his intentions. After the initial seconds of song, she flies, not away from him, but lands closer to him. She is still unsure if he will attack her and towards the end of the video, she bares her beak at him.

Half-an-hour after the video is recorded, I see him going into the box where he continues to sing to her.  She goes to the perch that is nearest to the box and I know that all is likely to be fine with this pair.