Better Listening

Sunday when we got home from camping the littles ran to the neighbors' to play.  One went one way and one went the other.  I unloaded the car and then gathered the kids to go to Pat's house.  The little woman was going to spend the night. 
So on the drive I hear him telling her about an incident on the trampoline.  He said he was being a little too rough with the littler kids.  Some man let him on his back on the trampoline and then jumped and then went down on his butt and it hurt my little man.  I didn't catch the inbetween or wasn't paying enough attention.....I was driving. 
I didn't think much more about it.  All week so far the little man has been playing fine, but every night he has been complaining about a sore throat.  But he points to his chest.  Again I'm hoping he isn't getting sick.  I'm not sure.  My mind is more on dealing with the little woman's anxiety, the dog, the house, working long hours this week. 
So tonight he is again complaining about it but he tells me more of the story or the part I didn't catch.  Seems when he was being a little too rough with the littler kids, the man on the trampoline was teaching him a lesson and being a little too rough. And that is when he got hurt in his chest.  He says it hurts when he sneezes and sometimes when he breathes.  Oy.  He was having a hard time finding a sleep place.  I told him to find a place that doesn't hurt and go to sleep.  And he did.  So obviously it hurts more when he is laying down.
My eyes were filled with tears and my heart again broken.  Some man who we don't know decided it was a good idea to teach my six year-old a lesson. And he did.  My little man was telling me how he didn't know he was being too rough and explained it sadly.  He got it.  And he is still learning that lesson three days later and now maybe should see a doctor.  Because some man never learned about being too rough with those littler than him. 
And yes, my little man has some issues and plays hard and too rough sometimes.  I'm pretty sure there was a better way to deal with it.  And now I don't know if I talk to the neighbor or just let it go.  I hope my little man heals fast. 
And I need to listen better the first time around.