I am not to sure about the more active part because when my bp is in shed he doesn't move at all. The hissing is quite normal though, that is to be expected because your snake is in shed. I don't mess with my snake at all when he is in shed. Your snake could possibly be a bit stressed out, that is the only reason I can think of for the movement. How are your temps and humidity? Make sure you have your humidity at 60% to 70% so your snake will have a complete shed.