It's about creating amazing lighting effects without too much effort.
Basically it's how it works:
- take a character and duplicate it
- give the duplicated character (which should be over the original on layer order) some blur and change its layer blending mode (overlay, add, luminosity, etc)
- render the frame to see the result
If it's not working well you can try with changing the blending mode, or increase/decrease the blur or transparency.
More experienced users could play with masking or with the blending modes of other layers. For example, a layer with a gradient gives fantastic effects with the right mode and transparency.
It's all about play

Here you can see a couple tests:


Spaceship test video Here (mediafire, 4 mb)