User blog comment:Hidden Scorpius XI/An ever-present detail/@comment-3146930-20150120213220/@comment-25405817-20150121032948

I think it's a little bit of both, actually. With Jaune's shield, she had to concentrate on the object and physically reach to it; She did a shockwave thingie to take control over the soda cans; and with Merc's greaves, she made physical contact with one of them before she could deflect his kicks. As how I see it, she has to either concentrate on an object or physically touch it to gain control over it.

And as for the tiara not being a power limiter, I couldn't agree more.