ouch that looks rather unpleasant. i've gone to flats after riding clips for most my riding experience of about 8 yrs. mostly i like it now but it was a struggle and i worry about shit like this happening as i still don't have perfect foot control when things get fast and hairy. i gather it develops with time and practice? when i see what is done by guys on flats i think it must be a skill that comes in time. i hope…
Keep your weight on the balls of your feet but more mid-foot and keep your heals down. Keeping your heals down will allow you to stay more connected to the pedal as your ankle can flex and allow you to almost have a bit of suspension on the pedal. Riding clipped in, you tend to get on your toes and this will not give you the control you need.