I think the defense's fallback position will be to try to sway the jury to 2nd degree if they simply don't believe it was self-defense. They are trying first to get Arias acquitted (as defense attorneys they have to do their best for their client), and will ask the jury to consider the circumstances of all this activity taking place within 1 to 3 minutes of time. With 2nd degree their client could get out of prison someday. Not someday soon, but eventually, decades later.
So naturally any defense attorney will try to get their client off as a best case scenario (they know this is a longshot). And if that fails, try to get the jury to see this as a "crime of passion" level of murder.
I enjoy debating the cases I follow & my writing style can sometimes be direct & "cut to the chase" in tone. No offense is intended & my posts aren't personal, I promise!