I know you know that. I was just re-stating the obvious to challenge the author's assertions as well. :-)
I think it will be come clear at trial that asking someone what they're doing isn't reasonable cause to start beating them senseless and that being beaten senseless is reasonable cause to defend yourself with deadly force. Especially if testimony and forensics support the case that Trayvon tried to take the gun from Zimmerman.
I hope Z's lawyer makes that case well and I hope the jury (if it gets that far) isn't composed of politically correct Zombies.
Obviously Corey overcharged to get Zimmerman to plead out. I hope he and his lawyer resist.