We could of course argue that Scotty keeps coming and going. Like, "All right, Mr. Scott, I'm here now. What do you want me to do, exactly, Sir?" "Stand by, Mr. Scott." "Bloody 'ell, I've got things to do." (turns around) "Mr. Scott, it is imperative that the transporter be kept from activating again." "Shoulda said so, Sir. Will do." (turns around again) "Hmm. That's pretty clever. Don't know who did it, but... Whoa, it's reversing! I need my dynospanner!" (turns around again) "Unless..." (turns around again)
Etc.