Farrell, OK, I don't have a PPL, but I'll waste some bandwidth by declaring tham I am sceptical about the decision to continue rather than make a precautionary landing.
I find it inconceivable that anybody could lose a portion of wing (of whatever length) in the circumstances and not notice the impact nor the absence of a portion of said aeroplane. Have you ever seen the pic of William of Gloucester's Arrow after it hit a tree in similar circumstances during an air race? Lost rather more wing, but then so did he.
I know which of this thread's contributors I'd rather fly with...
By the way, I've always had a great affection for the C210, but this has undelined its strength and capabilities to me.