Doc: Look out!
The DeLorean reappears. It's steaming. Doc walks over to it and touches it.
Marty: What, what is it hot?
Doc: It's cold, damn cold. (Opens the door) Ha, ha, ha, Einstein, you little devil. Einstein's clock is exactly one minute behind mine, it's still ticking.
Doc's clock says 1.22, Einstein's clock says 1.21. Doc unbuckles Einstein's seatbelt and he runs happily into the van.
Marty: He's all right.
Doc: He's fine, and he's completely unaware that anything happened. As far as he's concerned the trip was instantaneous. That's why Einstein's watch is exactly one minute behind mine. He skipped over that minute to instantly arrive at this moment in time. Come here, I'll show you how it works. First, you turn the time circuits on.
Einstein's clock is exactly one minute behind mine
Einstein's watch is exactly one minute behind mine
As far as he's concerned
as far as A is concerned