SAS - the clue as to how switched off the guys in the cabin were is in their physical positions - as Um lifting points out, not very professional - kneeling in the door or lying on the floor would be safer.
Yes, you would assume that the person with their hands and feet on the controls would know how to ground taxy and a simple, one-sentence crew brief could have put everyone on the same page and prevented embarrassment.
However, I have been in the back of a few US Mil Blackhawks and crew co-operation was woefully lacking - a definite us and them partition between front and rear crew, with the latter being mostly ignored.
Without hearing the intercom conversations, one has to assume culpability lies with the handling pilot and, depending on which side he was sitting, the non-handling pilot - but sharp rearcrew could have realised what was about to happen and mentioned how close the edge of the pad was.
So many things wrong with this post.