“Stalking.”
You need to reevaluate your definition of "weasel words"
In this situation “Stalking” is not the weasel word.
Use of weasel word would be "Zimmerman had a right to follow Martin down a dark walkthrough"
"Stalking" is a loaded word characterizing intent. Following is a commonly used word that ascribes no intent one way or the other.
If you have no evidence that Zimmerman "stalked" Martin, then the correct, neutral word would be "follow".
Well, unless you aren't concerned with being neutral and objective.