1)
What is the word "Ve'hikriv Osah ha'Kohen" coming to preclude?
1.
Sotah 8a: It precludes giving two Sotos Mei Sotah to drink simultaneously - so that, in the event that one of them is guilty, she will not be encouraged to deny her guilt when she sees the other one pleading innocent. 1
1
See also Torah Temmah, note 85, who elaborates.
2)
What are the implications of the word "Ve'he'emidah Lifnei Hashem" - as opposed to 'Ve'amdah '?