It's likely that he's tagging you because he's still in a feeding mode and interprets your movement as another prey item. The only good reason I've ever found to feed a snake in a separate feeding cage is to keep it from ingesting particles of substrate along with their food.
If you use a particulate substrate, you might want to try putting a sheet of newspaper on top of the substrate and offering the food on that. Remove the newspaper when your snake is done eating.
Mark