>>6137947Set the camera down or on tripod then focus the picture, then set to a high shutter speed on continuous shot.
Go to the scene and off camera gently brush sand or whatever toward the figure and lay on the camera with a remote. In pic related he's sprinkling some baby powder or flour or something from above.
For blood effects he squirts food dye at the figure and 'shops out the stream.
Dig around his gallery and he has a few "behind the scenes" posts