fn update_urchins(
entities: Res<'_, Entities>,
urchins: CompMut<'_, Urchin>,
bodies: CompMut<'_, KinematicBody>,
transforms: Comp<'_, Transform>,
damage_regions: Comp<'_, DamageRegion>,
element_handles: Comp<'_, ElementHandle>,
assets: Res<'_, AssetServer>,
)