On Bava Metzia 33a Rashi gives a description of the route taken by the Kohen as he opens the doors of the main Heychal gateway. I get the impression that these lines of Rashi have troubled many a student of the Gemara, judging by the number of people who have come over to me and asked me to explain what Rashi means here. In honor of Daf Yomi reaching this sugya I will present my elucidated version of Rashi's words as I understand them.
