If we give "right by" as much flexibility as "near", then just being inside the neighborhood and within a few hundred feet of the house could be "right by" compared to being at the 7-11.
We're going on our interpretation of her interpretation of what he actually said.
Yeah, no room for confusion there.
Well, I'd suggest we a little more information in this situation.
1. Dee Dee tells him to run to his dad's house and TM tells her he's about to "run from the back". TM doesn't explicitly say where he's going to run or that he agreed to run to his dad's house, but he doesn't say thats not where he's headed. Matched with GZ's description of the direction TM disappeared, it would indicate he was moving in the direction of his dad's house.
2. Dee Dee describes him running long enough to be out of breath, though doesn't give an estimate for how long he was running. I'm guessing you'd have to run full sprint for at least 15-20 seconds to be as out of breath as she describes. A decent athlete even in street clothes would cover at least 300-400 feet in that time. IF TM is somewhere between GZ's parked car on TTL and the 'T', that would put him somewhere between 250-350 feet from his dad's house before he ran.
3. Dee Dee tells TM to keep running after he had stopped, but said he didn't need to because he was right by his fathers house. TM was scared according to Dee Dee, but felt safe enough in being right by his fathers house to not run or go inside.
4. He lost GZ. GZ had gotten out of his car and headed toward the T. TM was far enough away from the 'T' that he said he lost the man who was somewhere around the 'T'.
We have a lot more detailed information than just a statement that he's "right by" a certain location. I can't think of another location TM would have been given the totality of the information.
AS for Dee Dee's statement, "he started walking back again". She's confusing enough and the statement is vague enough to be open to interpretation. BDLR also doesn't help the situation by giving her a statement to agree with instead of asking what she meant by it. I think it was asked what I make of the word "again". I think in context it could mean just walking again, or it could mean headed to the 'T' again. I think most people describing someone who is simply changing the pace of their movement would have said, "started walking again" or "went back to walking". She doesn't have a very good command of the English language, so that could explain the redundant use of both "back" and "again" together, or it could be (and more likely I think) that the word "back" was added to describe a direction. I think given the other evidence that TM ran/skipped away from the 'T', was out of breath enough to be a significant distance away, was right by his fathers house and then ended up back at the 'T' where the face to face confrontation occurs, I think its pretty clear he did walk back to that area again. BDLR didn't bother asking Dee Dee how he ended up there, but Dee Dee describes TM by his dad's house, then walking somewhere else while keeping his voice low.