I understand. The only svara that I could think of is that since he’s oisek in a mitzvah that might also be called “kvod shomayim” he might be puter from kavod hashechina. Like in shul if someone is holding one of the sifrei Torah he doesn’t get up with the rest of the shul when the other sefer Torah is picked up. Unless you tell me that the din applies even during other avoidah, that’s what I would say.
Then once he’s allowed to turn his back, comes the din that he should turn right instead of left. That’s my own svara though, I really don’t know otherwise.
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