Us guys in the New Haven Cycling Club in the mid-1960s perfected the technique of dismounting by kicking the left pedal forward at the top of the pedaling circle while simultaneously lifting off the saddle, swinging the right foot back, and finally grabbing the saddle as the bike rolled away forward. A bit tricky with TA Jacques Anquetil nail-on cleats on a slick surface. Haven't thought of that, much less tried it, in at least 50 years.