I've caught small pebbles before while on the bike going down the highway, doing like 65-80mph. I couldn't imagine the pain of having a boulder like those kicked up and it slamming into my finger.I thought there were going to be some big issues after Bottas dragged half the gravel trap back onto the track with him. Er, sorry, I meant to say BOULDER trap. Jesus those stones were HUGE. I would not want one of those to be kicked up at my head or hands.