Yes, that could be a painful experience. My feeling is this...

Dedicated road pedals are not really designed for a lot of float but mountain bike pedals are. I like SPD pedals, specifically the Shimano XT's. They have a good amount of float and hence a lot of flexibility in the twisting and rocking associated with aggressive riding. Other pedal systems are good to though but I would gravitate towards mountain bike systems as they will most likely be less susceptible to unclipping at an undesirable time.

Just my opinion....