Since there is no more Tosfos on the Mesechta, we'll go back explaining earlier Sugyas in Birchos Kohanim while it's still fresh in our mind.
Sotah 38: we end up that even people behind an iron wall doesn't separate himself to the Bracha.
Tosfs asks: since they weren’t forced to be behind the wall, why is it any better than the people standing behind the Kohanim?
Tosfos answers: since the Toarh explicitly said that Birchos kohanim should resemble someone talking to his friend, therefore the Torah is Makpid that they should face each other. However, we don't see and Hakpada not being behind a wall.
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