None of the real Hersheimmer's friends or intimates saw him before he sailed though indeed it would hardly have mattered if they had, the impersonation was so perfect.
Hersheimmer's impersonation was terrible. Everyone could see right through it.
mnli hypothesis: Hersheimmer's impersonation was terrible. Everyone could see right through it. premise: None of the real Hersheimmer's friends or intimates saw him before he sailed though indeed it would hardly have mattered if they had, the impersonation was so perfect.