If I remember correctly, the umpires erred in the Segura case by not making it clear to him that HE was safe and the other guy was out. They made the "Out!" call after Segura slid back to the base, so he was face-down on the ground and had no idea who they were calling out.
So would it be allowable for a runner who has already secured second to surrender the base and run back to first on the next pitch? In essence, a reverse steal. I could perhaps see the advantage in this if the open first base would allow the opposing team to walk a dangerous hitter. The new no-pitch IBB complicates this strategy and makes it a moot question but would it have been possible before?