One time in an arm styling class a woman told me she needed more tension in my lead. I replied, "I'm sure you do." In all fairness I'm sure I should have been giving more tension to the lead, but it was my first arm styling class. Leading properly and arm styling were too much for me that day. I'm sure I should have explained exactly that but, well, we are human after all.
Seriously, throwing in the extra (free) arm movement was too much for my brain to juggle.