Usually it looks like watered down blood,sometimes bright, but it sounds like she may have been in heat for a little while already. When I watched the video, (before I saw this post) I was thinking she looked a little swollen (in the back) As her heat progresses, she will be more swollen. it lasts about three weeks-is Rebel castrated? If so, he may still get "turned on" by her, as her heat cycle progresses. Keep an eye on them!