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I imagine that's a grin of pure fanboy glee :)
I know what I'd be thinking. "Quick, get into the TARDIS, we'll make a clean get away!" Those are my two favorite Doctor in one place. I imagine i'd become idiot of the year standing beside my idols. IMHO, they are both very lucky men.
I bet the people there couldn't believe their luck when they saw that box in the churchyard!