DeniseGoldberg uses "Speedplay's Frog pedals which are a totally free-float pedal."

I gotta question for Speedplay users, if they are totaly free-float how do you unclip?

I mostly wear Shimano ATB shoes with a Shimano clipless pedal system. If I turn my heel in any direction past the float it just unclips so I always wondered; if it just floats, what's the action to unclip?

Am I making sense?