Nadal has definitely handled the situation of this moment better than Novak, and is containing his focus and nerves better. Djokovic seems well and truly rattled now and it does indeed look like we are headed to a decider!
Nadal should continue to extract chances to attack by using more variety at the right moments. He has shown that he is plenty capable of outmanoeuvring Novak with tactical guile. So, there's no real reason to stop now.