Fast Motion
Speeding up the action squeezes a stretch of ground into a few seconds, so the gap between the runners and the cart closes fast.
Fast Motion AI Video Prompt
Handheld shot + fast motion: On the north side of the main corridor, the camera tracks east with the cart, keeping the direction of the cart's front and the push handle at the rear readable. This part plays at a super-fast pace: the floor and stacks of crates visibly sweep past behind the characters, and the spin of the wheels and White's movement with the cart speed up together. Biwa and Suseka run up from behind, catch up and run alongside the cart;
How the Edit Works
The speed-up here was requested in the prompt within the same generation: the first four seconds of one shot are written as a super-fast pace, and the prompt names what should speed up with it: the floor and crates sweeping past behind the characters, the spin of the wheels, and White's movement with the cart. In the clip the clearest sign is the crates at the edges of the frame flicking past in an instant, while Suseka and Biwa get from deep in the corridor to the cart's side in about three seconds.
When you write fast motion, give the second it starts and the second it ends, and state in the next segment that speed returns to normal, so the whole video isn't sped up and the return to normal doesn't turn into a freeze. How fast it feels depends on how much background there is to measure speed against. Body movement may not speed up with it: here the two women's strides look close to normal, so check each segment after generating.
To compress a dash or a chase in your own film, mark where the speed-up starts and stops in your storyboard, generate the segment with the fuse AI film maker, and check the pacing segment by segment.
Story Clip
Source film EP3 Shot 1 · Lamp Cart · 00:11–00:15
White drives the lit lamp cart down the main corridor toward the camera. Suseka, holding the blue-glowing crystal, and Biwa run up from behind and end up on the left and right of the cart.
What to Watch For
Watch the crates at the edges of the frame: they flash in and out much faster than anyone is running, which is the easiest place to spot the speed-up. Then watch the distance between the cart and the two women, who go from small figures deep in the corridor to right beside the cart in about three seconds. Their strides don't look especially hurried; most of the speed comes from how fast the background sweeps by and how quickly the gap closes.