1 - A close-up of the door's bell ringing as the door opens.
2 - A much younger Darren walks into the shop. Not only is he noticeably younger, he also has none of the robotic / cybernetic modifications seen in the present timeline.
3 - This younger Darren goes up to the counter and speaks to the elderly couple.
DARREN: Excuse me...
4 - Return to the table where the clock sat. The table is bare, as both the clock and Sarah have disappeared. All the remains is a few motes of purple glittering where they formerly were.
DARREN (off-panel): I've been seeing this amazing girl and she has a birthday coming up...