That was certainly a nice moment, and if I had made the big boss comparison I probably would have commented more on the sneaking mission.
I felt it might have been too casually subverted, but it still played out nice. The guard opening the door was icing on the cake.
I also liked them running out of 'time' before the 'disaster'. Really, most moments of this episode fit together like well oiled gears. :3
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There is no shame in not knowing; the shame lies in not finding out