User blog comment:B214/Light Novel Volume 16 spoilers/@comment-9339850-20131020192040/@comment-9339850-20131020194324

There was one, one of Saiarog's female servants during his and Rias' Rating Game, since her plan/thoughts were to start undressing, Issei wasnt able to get any actual battle information. So technically it wasnt blocked per se, but it was definitely countered to a degree