I agree with all these who suggest there shouldn't have been any changes in our approach to the second half, and that we should have continued to take the game to them, and let them worry about us.
What I certainly wouldn't have done was take off one of our two best players a few minutes into the second half - replacing him with one who was completely innefectual.
What bugs me about that switch was that he did the exact same thing against Partick Thistle in this competition at Partick, when he took Sanchez off early in the second half, which completely changed the pattern of the whole game - We led, and had controlled the first half very comfortably, but let PT back in the second half, who equalised, and were unlucky not to win in extra time - Esson saved our bacon in the penalty shoot out.
It appears to me that TB never seems to learn anything from his mistakes.