Towards the end of the JCSAT-14 live webcast, after the satellite was deployed, we could see small thrusters firing on the second stage, starting to rotate it:
The webcast ended shortly afterwards, with (I believe) no explanation of what was happening1, so I'm wondering what the purpose of this was. Perhaps to get ready for an engine relight to re-test that capability / deorbit the second stage more quickly?
1Note that before the deployment, they did mention rotating the stage, but that was to stabilise it before deployment. I believe this later rotation is unrelated.