In reply to bpmclimb:
I was climbing in the peaks with an American climber who was with our club on a term abroad. He'd never climbed on twin ropes despite 7+ years of experience. We were doing an E2 Overhang on high neb and his leg got caught behind the rope on the crux. He came off and got spun upside down, luckily jut dangled in the air due to the overhanging nature of the climb.
I do think a lot of climbers need to be more aware of how the move in relation to their ropes as this can cause some really dodgy situations which are easily avoided. But it is even more difficult when dealiing with twin or double ropes as there is twice as much to get caught up in, and sometimes one of the ropes hasn't clipped into gear in a while and isn't pulled into the wall making it even easier to flag out a leg behind the rope. In the end wearing a helmet is always a good idea!