Marty: I hope so.
Doc: Don't worry. As long as you hit that wire with the connecting hook at precisely 88 miles per hour, the instance the lightning strikes the tower, everything will be fine.
Marty: Right.
Doc then finds the note in his pocket.
Doc: What's the meaning of this?
Marty: You'll find out in 30 years.
Doc: It's about the future, isn't it?
Marty: Wait a minute!
Doc: It's information about the future, isn't it!
Doc tears the note up.
Doc: I warned you about this kid. The consequences could be disastrous!
Marty: Now that's a risk you'll have to take! Your life depends on it!
Doc: No, I refuse to accept the responsibility!
Marty: In that case, I'll tell you straight out.
The lightning strikes a tree branch, causing it to fall over and disconnect the cable. Doc looks at it, putting the letter in his coat pocket as he does so (you have to look very carefully to see him do it).
Doc: Great Scott! You get the cable, I'll throw the rope down to you.
Marty: Right, I got it.
Doc picks up the rope and Marty picks up the cable. Doc runs up the Courthouse stairs to get to the clock. The clock turns to 9.58. Doc opens the door next to the clock and steps out. He sees the gargoyle next to it.
Doc: Ahh, hoo ooh, ah!
Marty: Doc!
Doc throws the rope down and Marty attaches it to the cable.
Doc: C'mon, c'mon let's go.
Marty: All right, take it up, go.
Doc pulls it up. Marty shouts to him.
Marty: Doc!
But Doc can't hear due to the lightning.
Doc: Huh?
Marty: I have to tell you about the future!
Doc: Huh?
Marty: I have to tell you about the future!
More lightning.
Doc: Ahh!
Marty: On the night I go back in time, you get...
The clock strikes 10 - for what will be for the last time!
Marty: Doc!
Doc: Go, go! (gestures with hands)
Marty: No, Doc!
Doc: Look at the time, you've got less than 4 minutes! Please hurry!
Marty gets into the car and drives off. Doc sees the DeLorean leave.
Doc: Yeah!
The clock turns to 10.01. Doc then climbs over the ledge, and looks down. As more lightning happens, Doc slips. Meanwhile Marty reaches the white line on the street outside the Bluebird Motel, parks the car and connects the hook into the flux capacitor.
Marty: Dammit, Doc, why did you have to tear up that letter? If only I had more time... wait a minute, I got all the time I want! I got a time machine! I'll just go back early and warn him. 10 minutes ought to do it.
Marty changes the destination time from 1.35am to 1.24am.
Marty: Time circuits on, flux capacitor (pausing, trying to think of a word) fluxing, engine running, All right!
The engine stops.
Marty: No, no, no, no, no, c'mon, c'mon!
At the clocktower, Doc almost connects the cable, when he slips. He breaks a bit off the ledge as well. The cable slips down and catches on his trousers.
Doc: Whoa! Oh!
The clock turns to 10.02. Doc manages to get the cable back in his hands, then tries to connect them. But he can't. The fallen branch is stopping him from doing so!