I agree if you extended the conductors from MC cable through the EMT it is a technical violation. I also think that, presented with it, I would say it was better than another splice.
There should be marking on the MC cable that will suffice to tell me what the conductors are.

If this is FMC that they are using, no foul at all.
You should be pulling a marked discrete conductor anyway.

Since you don't have a firmly mounted box it will make strapping that EMT termination more important. (assuming you are transitioning to a whip)


Greg Fretwell