What this song renders
The load-bearing facts are documented — unusually, by the killers themselves. The principal source for the night is Yakov Yurovsky’s own accounts, corroborated by squad statements and the forensic record. The eleven captives (the seven Romanovs and four retainers) were taken to a basement room, a death sentence was read, and a squad opened fire.
The jewels are the song’s spine and they are real: the empress and her daughters had sewn diamonds and jewels into their corsets and bodice linings — both hidden wealth and, the killers found, a crude armour. The gems deflected bullets, the girls survived the first volley, and the squad had to finish the killing with further fire and bayonets. The historical horror that the sewn-in love prolonged the dying is exactly what the track’s two-volley structure encodes.
The cried line — ‘you’ll have to do it twice’ — is the song’s dramatisation of the documented fact that the killing took more than one volley; it is a separately-recorded utterance, not a verbatim quotation. The exact choreography (who fired at whom, in what order) is reconstructed from the squad’s mutually inconsistent accounts and is held loosely; the load-bearing facts agree.
The cellar execution, the read sentence, the sewn-in jewels deflecting the first volley, and the killing taking more than one volley are documented — attested by the perpetrators and corroborated forensically. The minute-by-minute choreography is single-tradition and contested. No gore is depicted. See Truth & Legend.