Jordan Davis Murder Trial - Accused will use Justifiable Use of Deadly Force

This is posted in the Gun Control Reform Activism Group
http://www.cnn.com/2014/02/05/justice/florida-loud-music-murder-trial/

I'm keeping a running thread in the African American group on the nuances of the trial - but I find this interesting.

If you've kept up with the case - then you know Dunn (the accused) is claiming he was in a kill or be killed situation.

During his interrogation he said he saw a gun (stick?) and suggested to the the interrogators that perhaps the other vehicle dumped it when they drove off.

I'm wondering that if this statement is allowed in - if Angela Corey (this is the same D.A. from the Trayvon Martin killing trial) is even going to allow her team to have the fact that the other car - the one the murdered kid was in never even drove off?

I don't know - I know there has been a lot of relating/comparison of this to the Martin case - but Trayvon's killer used Stand Your Ground.

This killer's attorney seems to be taking a different tactic to prove 'state of mind' and purpose for pulling his gun.

Thoughts from the group as to why they are taking this approach? What am I missing here?