Yeah I guess I was just thinking how speed is measured in our universe, and seeing how that applied to Steelrunning. It lead me to these questions. I think I am leaning towards the third option.
Storing time for themselves only, not a bubble
Storing distance, which doesn't really make sense unless someone
They store Distance over time which is speed (so both)
Now that I think about it, when someone is storing speed, they have to be moving, right? So it does involve distance in the sense that you have to change your position in space. So when you are storing speed, you have to move and its going to take more time to do it.
I think I convinced myself out of my own theory, ha!