That is a separate lesson; worthy of taking all the time needed to teach before a young dog habituates that behavior -- whether in fire drill or pile work. Shopping, picking up multiple bumpers and any hesitation before returning are all counter-productive behaviors. Teach that lesson at a close distance; close enough that you can send your pup to a pile of bumpers with a 8-10 ft rope that you do not let go of (at least initially, until the dog is doing it correctly at that very short distance). In this lesson your focus should be on three elements: (1) An explosive send-off when you command "fetch" or "back". If not, you need more prerequisite work on The Game and fetch. (2) Fetch the first bumper he finds. If not, you need more prerequisite work on fetch, first with a single bumper on the ground (a pile of one), then with a small pile of 2 or 3 bumpers that are spread out enough that it is crystal clear to both you and the dog exactly which bumper he "finds" first. Upon making that "find", the lesson is (a) immediate fetch, and (b) immediate return. Reinforce fetch and/or recall with the rope (or ecollar if collar conditioning is thoroughly completed on these commands). If you are training according to Bill's methods, you have previously established a high standard of excellence on fetch and recall with conditioned reinforcement. (3) An immediate recall. If not, you need more prerequisite work on recall with conditioned reinforcement. Establish a high standard of excellence on recall in general scenarios involving fetch or retrieve and in scenarios outside of retrieves, with increasing levels of excitement and competing attractions. If this seems like a lot of work to do in order to be able to do fire drill marks with your dog, then you are overlooking a key and basic principle of good training. That is, EACH individual skill needs to developed to a high standard of excellence before combining with other skills in a complex sequence of skills. The development process of a skill or a command has four stages: (1) Teach (2) Reward (3) Reinforce (4) Practice