Hey, the idea of a “minimal change” that won’t bite you in a paradox is like trying to find a needle that can’t be found in a haystack. Every tiny tweak ripples, and the point where you hit a paradox is essentially a cliff. What I can tell you is that in the models we run, the threshold is usually on the order of a single event that flips a decision point—say, someone else deciding to take a different bus. Below that, the timelines diverge but still loop back; above that, you get a self‑contradiction that tears the fabric. So the math gives you a range, but it’s more of a guideline than a guarantee. The trick is to keep the change within a branch that still has a viable closure. That’s the only quantifiable “safe zone,” and even then it feels like walking on a razor’s edge.