When that happens to me I just stand back for a few minutes and in a loud but polite voice say
” I seem to be getting in this guys way, I’ll just hang back while he gets his shots”
With no shots to copy they soon stop, and if they don’t, the B&G soon realize that they are paying me for shots and ask him give it a rest. If he starts copying again you can either repeat the action ( and this time the B&G will get pissed at him) or just politely say “I gave you a chance to get shots, now let me have mine”
To the B&G you’ll come across as nice!