Mickelson needs to take a deep breath now and just focus on making par at 11. He has a tendency to follow up really good holes with blowups because he loses focus.
Given that Rose has (uncharacteristically) holed so many putts, he needs to play near perfectly to win and/or force a playoff.
A great shot is when you pull it off. A smart shot is when you don't have the guts to try.