I uploaded a similar video earlier but I had a discussion with my student last night about not getting bogged down in Chi Sao.  Chi Sao is not fighting.  It's a tool to help compliment and facilitate your fighting applications.  

Chi Sao Fighting Applications Vs. Straight Punch

Chi Sao or "Sticky Hands" in Wing Chun is only tool to condition one's contact reflexes.  It's not in itself a method of fighting.