Has this ever happened to you? Baby being dropped...?

...my friend came over last night. I hadn't seen him in months. He took my 11 week old from my grandma and was talking and playing with him. I was a little nervous, I always am when someone else holds him, but my friend has a 22 month old so I figured he knows how to handle a baby. Well, I was standing about 10 feet away and when I turned around my friend (was sitting on the couch) bent down to get my sons pacifier off the floor and my son swung his head back and went flying! I did a total supermom dive and caught him before he hit the coffee table (and then the floor). He screamed bloody murder and tensed up really bad for a few minutes. Then he ate and went to sleep. I called the doctor and he said just to keep an eye on him because the way his back bent wasn't cool. He seems perfectly fine today although I am still keeping an eye on his spine. Thing is, I didn't want my friend to feel bad because I knew he already did and it was an honest accident. SO I didn't really say anything about it except that I should have warned him to use both hands. My friend stayed for a while but now it's all awkward and he doesn't really want ot talk to me. how do I handle this? I knwo he didn't mean to do it and I'm not mad at him, but it definitely scared the crap out of me and I probably won't let other people hold my son for a while.