The gf heard nothing after the inital "why are you following me" and "what are you doing here, then a push, the phone went dead. that probably took seconds.
So how in the world does that mean that she would have heard Trayvon say he saw a gun, or that he may not have seen the gun until GZ said, what are you doing here?
You think Trayvon had to say, OMG he's gotta gun! as soon as he said, why are you following me?
It's not plausible to you that Trayon saw the gun or the gun came out right at the initial exchange or right after. Ok, you are certainly entitled to think what you like.
JMHO
In what world does someone push someone else when there is a gun out and drawn? If she heard GZ talk, he was within earshot of the phone, which means he was somewhat close to TM. If the gun is out of the holster, in GZ's hand, at that close range, he's going to see it, unless he had his hand behind his back.
Yes, I think he would say that he had a gun, he was already on guard because GZ was following him to begin with. If he saw the gun, he would of said, this guy is following me and I think he's got a gun.