I think he avoided taking the pawn because he didn't want to have to deal with the resulting pin, although it would been better than what actually played out.
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Here is a game where I was comfortable going into a longer endgame, but I found a mating sequence that brought the game to an end very quickly. It all starts out with finding the first more to set off the demise... I'm sure it will not be to hard for you to do it yourself.