OK, so let's suppose you're right.
when zimm said "then i went towards him", he really meant to say that martin had showed up again (but left that detail out in the interrogation), and so now that he knew where martin was he went towards him.
let's look at that interaction.
so martin comes into the development through the only way in, which is the area behind the houses since the gate is closed and he doesn't have the key or gate remote on him (gate closes at 7, no fob or key found on martin).*
as he's getting to the main road, retreat view circle, zimm happens to be driving by and slows down to take a good long look at martin, never identifying himself (as per the reenactment video).
martin continues on down the sidewalk towards the clubhouse mailbox area to shelter from the rain, zimm pulls up on him while on the phone to dispatch. martin starts walking or walking faster faster now and maybe runs ("shit, he ran" and jeantel's testimony) down toward his house, which is past the T.
zimm gets out and follows him, hangs up with dispatch shortly after and he's near the T, supposedly looking for an address in the back of the houses. martin is off somewhere talking to jeantel on the phone still. we know this by the phone records.
minutes pass. zimm has had more than enough time to get back to his car, and martin has had more than enough time to get home. suppose zimmy is out there with his flashlight looking for martin, and martin comes back to the T area where we all know the final confrontation happened.
he didn't come out of nowhere, zimm had two flashlights.
so martin comes up and asks "why are you following me?", and now zimm knows where he is.
zimm responds "what are you doing here?" and then goes toward martin.
now tell me, who approached who? the kid who ran away then asked a question, or the grown man who followed and followed a kid, and then started walking towards him?*