More on Beit Hillel's understanding that one placement of blood on the altar is sufficient - as derived from the "atonement" as stated in each verse about the sin-offering. The Gemara probes whether the law can be derived via logic, which sounds plausible, and not only from the verses - for example, an inference about the outer altar placement of blood because of the placement of blood on the inner altar. Also, not the shift in the cases, where Beit Hillel's position ends up being more stringent, and Beit Shammai more lenient, which is not their usual way. But look to Tractate Eduyot - as early mishnah! Note also more details of the placement of the blood, with details of what makes the placement acceptable to qualify the offering for atonement.