מנהגי קריאת תוכחה             There is a Minhag*, not to face the בעל קריאה  (standing in front of the בימה) when he Leins (reads)  the תוכחה. *Another Minhag is that the עולה before the תוכחה leaves the בימה immediately after his Aliya and doesn't wait for the end of the next Aliya to do so.  In some Shuls during the year when the Gabai wants to give an Aliyah to the בעל קריאה he doesn't call him up by saying יעמוד פלוני ב"פ since he is already standing there. All he does is point at him to take the next Aliya. Hence this is how the Minhag started for the בעל קריאה to get the תוכחה since there is no need to call him up. **The original Minhag was to put it in the contract  that the שמש needs to take the Aliya of the תוכחה. The רמ"א writes to call up יעמוד מי שירצה (no name) Whoever is willing to take this Aliya. The מקור חיים writes that the מי שירצה is a חיוב to be עולה on the first day Rosh Hashana and on the first day Shavuos. ie:  The מי שירצה is being compensated by getting an Aliya on the first Yom Tov after the תוכחה  *אגרא דפרקא,דרכי תשובה,מנחת אלעזר     ** מהרי"ל