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Which version of After Effects are you running? If you're on CS6, have you tried using the 3D Camera Tracker? If the camera movements aren't too complex you should be able to use it to create a 3D Camera with 3D track points that match the original movement of the shot. If your shots can be solved in 3D space then you can attach objects to the 3D track points. These objects could be red solids with masks that you could animate as your puddles of blood grow larger. Here's a link to a tutorial on how to use the 3D camera tracker:
Once you make everything 3D and solve your 3D camera, try playing with the settings and lights in the screenshot below to see if that gets you the spectral highlights you're looking for on your puddles of blood:
Fantastic. I am running CS6. So I will check out the links you posted and give it a try. Sound perfect though. Thanks so much.
I watched the first video and I think this is exactly what I need. Thanks very much. I will post when I have had a chance to try it out!