A resposta curta é que não sabemos. Certamente o Imperador tinha seus próprios guardas e clones de escolta de soldados, mas além do pronunciamento de que os Jedi tentaram assassiná-lo, não há A explicação do que o público em geral foi informado sobre o evento que não o Imperador tinha duelo com os Jedi e de alguma forma superou-os, embora à custa de ser ferido.
Note que a esmagadora maioria do público tinha pouco ou nenhum entendimento dos poderes do Jedi médio e poderia pensar que seu sucesso era estranho, mas não necessariamente perceber quão drasticamente improvável era que uma não-força solitária e desarmada -O usuário poderia matar três Jedi armados.
De Tarkin
There were many stories about what had occurred that day in the chancellor’s office. The official explanation was that members of the Jedi Order had turned up to arrest Supreme Chancellor Palpatine, and a ferocious duel had ensued. The matter of precisely how the Jedi had been killed or the Emperor’s face deformed had never been settled to everyone’s satisfaction, and so Tarkin had his private thoughts about the Emperor, as well. That he and Vader were kindred spirits suggested that both of them might be Sith.
Tarkin often wondered if that wasn’t the actual reason Palpatine had been targeted for arrest or assassination by the Jedi. It wasn’t so much that the Order wished to take charge of the Republic; it was that the Jedi couldn’t abide the idea of a member of the ancient Order they opposed and abhorred emerging as the hero of the Clone Wars and assuming the mantle of Emperor.