I'm working on a short film right now titled "The Day After The End". In the movie there is a scene where a barn is being blown up. When we film this I want to be able to film one of the actors in the movie running away then have the barn blowing up in the background. I have After Effects and all the stuff to make it possible, the only problem is I just don't know how to actually do it. Can anyone help me out?!?