The bird singeth not

 It was not the melody, this time, that drew my attention but flapping of wings and threatening calls.  The White-rumped Shama was in a confrontational mood but unfortunately I couldn't locate the threat although all I did see seconds earlier was a black bird that flew in.  Was it the same, or was it the aggressor?

Fortunately its defensive, or was it aggressive stance worked!

And this resident eventually left too.