It definitely does not make for a 100% Safe way of Fishing a Running Lead.
I really experimented with Leadcore on a water over Christmas/New Year time, getting into the water to check its safety aspect with regards as to its twist and trapping Run Rings, beads etc on it. It does not take much for leadcore to become dangerous (Leaders Thread and another in Advanced Carp Fishing, sorry can't remember which one).
Tubing it is then.
I haven't used running rigs before, I usually use Korda Inlines/Leadclips with tubing. Didn't know leadcore was prone to twisting. Valuable lesson learnt, hopefully others will read this.