HiguraShiki
[10] Knight
I decided to try out Hilde earlier this week. My friend chose Maxi.
I caught him with Hilde's CE a couple times while he was in back-turned. The first sequence connected as normal, but the last hit whiffed. I've seen footage of Hilde's CE fully connecting on a back-turned opponent. Is this range-dependent? A Maxi-specific bug?
Sony currently has my PS3, so I can't test it at home right now.
That tends to happen sometimes. If you did not land the Critical Edge correctly, sometimes either 1 or more of the hits will whiff, including the final strike.
It doesn't happen often, you shouldn't worry about it too much.