Greetings,
I had the same thing happen to me earlier this year. Was stopped at a red light when a teen txting rear ended me. About a 15 mile an hr impact. Enough to crack the bumper causing 2900.00 damage. Not likely you had any frame damage but always good to let a good body shop guy give it a once over. I didn't even notice the crack until the body shop pointed it out. Also, purely a personal opinion but I always get a police report to document for insurance purposes after an accident. I learned years ago that "gentleman" agreements to pay for damage don't always materialize. When I did this without a police report the offender turned around stated the accident wasn't his fault and refused to pay. His insurance company also refused to pay stating it was his word against mine. So live and learn. Sorry your runner experienced this. Had mine only one month (new) after this occurred.