That is interesting.
I checked the 2014 NACD standards. The intro class has a "limit" of 100', the full cave class has a 130' limit.
However the standards are very much unclear about whether the term "limits" only applies to training, or as post certification limits too.
And if theses limits do apply to certified divers, as they would need to in this case, how can a full cave certified diver ever do a Trimix class in the first place?
Rick, can you enlighten us on how this example James quoted would technically break standards?