In order for them to make this a memorable and terrifying spectacle, they had to make sure that there was an audience, and most importantly they showed the victims horror and terror to the audience.
It was exactly for those reasons that they came announcing their arrival in such high and scary tones.
Too bad that no one came out of the Imperial Palace though, and it looked like no one was even bothered by the loud sounds.
Of course, the normal people all came running out of their houses to understand what the hell had happened, and witness who had barged into their place, but no one from the Imperial Palace.
This was embarrassing, extremely embarrassing!
"Damned and Vile Sun Empire!
Damned and Vile Sun Bloody Emperor!
It's Time you get your well-deserved Heavenly Punishment!"