This is the clearest case among the seven Hinokami Kagura dances covered on this hub of VIZ choosing compression over completeness. 烈日紅鏡 is four kanji carrying two distinct images — a fierce sun (烈日) and a crimson mirror (紅鏡) — and the visual in the manga bears both out: Tanjiro's slash forms a spinning red-tinged disc, sun and mirror fused into one circular motion. VIZ's "RAGING SUN!" keeps only the first half. That's not laziness; it's a legibility call. A four-beat callout like "RAGING SUN, CRIMSON MIRROR!" would be the longest dance name in the style once translated, competing for space in a small SFX-style word balloon during a fast action beat — VIZ consistently prioritizes a punchy two-word shout over a complete gloss when the panel is moving fast, which is a different translation instinct than the fuller phrasing used for something like "BENEFICENT RADIANCE" (輝輝恩光) elsewhere in the same twelve-form sequence, where the panel gives the translation more room to breathe.
The technique's most dramatic corpus appearance is its Vol. 17 use against Hantengu's split-off demon Zohakuten, where the callout itself is fractured across two panels — '烈日' in one panel, '紅鏡！！' in the next — visually mirroring the disc's spin with the reading rhythm. The immediate follow-up panel has Zohakuten's stunned reaction: '！？消えっ．．．た！！' ('HE... DISAPPEARED!'), underscoring that this dance's core trick is speed, not brute force: Tanjiro closes distance and lands the hit before the target's eye can track him. That's consistent with its two other appearances in the corpus — Vol. 9 against the Tsuzumi Mansion demon and the final duel with Muzan in Vol. 22–23 — where 烈日紅鏡 is always used as a follow-up strike chained immediately after an opening dance (円舞 or 陽華突), never as an opening move itself. In the choreography Tanjiro's father taught him, this is a dance built for the second beat of a combo, not the first.