It seems to me certainly unusual to see so much orange on the breast of Hainan Blue--perhaps just an artifact of the photo and the angle. If this bird is a Hainan Blue and has so much orange, I wonder if some birds could even have significantly more orange on the breast. The problem is that for Blue-throated (dialilaema) the reddish should form a more of a reddish V on the throat which is lacking here. This might indicate one of the other races (now separate species I believe) of Blue-throated Flycatcher but they would be very unlikely to occur here.