Individuals, not spreadsheets
Every creature on the field is a physical body that collides with others. A wall of 1000 Mechs does not deal 1000 units of pooled damage — it climbs, shoves, and stacks. Emergent behavior like piling and trampling is the mechanic, which is why the description leans on the word chaos.
Terrain becomes a tactic
With physics doing the fighting, the map participates: chokepoints concentrate crowds, open ground favors spread, and edges do what gravity does. The description confirms different maps exist precisely because terrain choice is a real variable in the result.
Outcomes have variance
Chaotic physics means two runs of the same setup can finish differently. A landslide result is solid knowledge; a near-draw needs replays. This is why the site's planners emphasize recording each trial instead of quoting a single winner.