I'd just get their address and send them a copy of the repair bill and your address. If they send you some reimbursement, be glad. If not, move on. Life's too short to argue over $50.00
I would continue to ride your route. Don't be uncomfortable, you're not the one in the wrong. The more they see you them more uncomfortable THEY should feel. Maybe to the point of sending you some money!
L8R
__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger