Almost every other template on this page is several hundred words long. This one is thirty-nine, and it holds its own against them, which is worth understanding before you write anything of your own.
What it spends its words on is physics. Sparks, shattering crates, a shockwave through walls — none of those describe a person, and all of them describe force. A video model has no trouble imagining two anime fighters; it has a great deal of trouble deciding how hard they are hitting each other. Naming the debris is the cheapest way to set that dial, because debris is a consequence and the model has to work backwards from it to the impact that caused it.
The camera clause is the second half of the same trick. "The camera bounces with each impact, handheld-style" is not a style note. It ties camera motion to an event in the scene, which means the model has to decide when the impacts are before it can decide when the camera moves. That single dependency is what makes the shot feel cut rather than generated: the picture has an internal clock, and it is the fight.
The ending is written as a single escalation — "their final clash sends a shockwave through the walls" — and it is doing something specific. Eight seconds of continuous fighting has no shape. One clash that is bigger than the others gives the clip a last frame worth arriving at, and it tells the model where in the eight seconds to put its most expensive motion.
What the prompt leaves out is as deliberate as what it includes. There is no hair colour, no wardrobe, no lighting direction, no lens. Every one of those would have been a constraint the model had to satisfy at the cost of the motion, and the motion is the only thing anyone will remember about a two-second-per-beat fight. If you want a specific look, that is a job for a reference image and a different template, not for more adjectives in this one.
One honest weakness: the source prompt describes no sound at all. H3 generates audio whether or not you ask, so leaving it unwritten means accepting whatever it invents. The sound lever above is the fix, and it costs you sixteen words.