In helicopter flying there are a few important things that pilots must recognize and react to intuitively. Things like retreating blade stall, low g, settling with power, soss of tail rotor effectiveness and low rotor RPM are just some of those important things. If you can't think of the symptoms and the correct recovery techniques then crack open the books and/or get some flight instruction.
For the fixed wing folks, this is the equivalent of not knowing how to recover from a stall or spin.
Every once in awhile an applicant will have problems with these very important, life changing, challenges. From a PTS stand point the check ride is over with but on a deeper level, what kind of pilot would we have if they where cut loose without this knoweldge?