@hawkeye10,
And why wouldn't it just be relevant to why Zimmerman is not covered by the Stand Your Ground law?
If he initiated the confrontation (which he did), then he's not shielded. After he lost that shield, his responsibility changed from "I can shoot if I fear for my life" to "I have to attempt to escape before I can defend myself with deadly force."
Showing that he lost that shield is very relevant to the case, and it's especially relevant that the prosecutor cover that base because the Stand Your Ground law allows civil suits if it is violated.