marker releases upwards from the toepiece, look sideways... and the old heels pivot. so, since twisting backwards falls blow your knees... marker stops it by letting you release vertically as well is to the side... but if you land backseat at all, you have a chance of the toepiece letting you go when you dont want it to. so, if you wanna stop that, you gotta crank on the din... and then youll probably blow the screw so... marker doesnt suck, and youll probably be fine on them, but... maybe not.