V'dam hayotzei misham

On 41a continuing to 41b, Ravina suggests that the second half of the braisa is talking about that the dam came out derech rechem and it's really based on the same machlokes as in the reisha. Rav Yosef asks two extremely obvious questions that it makes you wonder what Ravina was thinking.
Q1 - That's the EXACT same machlokes as the reisha so why does the beraisa bother repeating it.
Q2 - It says misham - from there - what else could "there" be referring to if not derech dofen which is what we were talking about in the reisha.
So what was Ravina thinking?
A to Q1: The Maharsha explains why Ravina wasn't bothered by the first question. It's true that if you learn like Rashi on 41b that the seifa is also talking about the dam of the three days prior to leida then it's the same machlokes but the Maharsha suggests that maybe Ravina meant that the seifa is talking about the dam that accompanies the birth and the chiddush of the seifa is that not only are the Rabbonon metamei the dam before the birth but even the dam during the birth (and R' Yosef believes that is no chiddush either - there's no reason to differentiate between the damim)
A to Q2: It's true that normally when you say "from there" it would be referring to the last place that we were discussing but maybe Ravina thinks that the braisa was just using a lashon nekiya so instead of saying that the dam came out derech rechem (or another term) it just says "misham" (R' Yosef would say that throughout other mishnayos and braisos it doens't use that lashon so why start now). - this answer was suggested by David Kramer (I learn the daf with him at night).
At least with this we could understand what Ravina was thinking when he suggested the answer.