Maybe he was trying to slow you down - coz ya know - you were going too fast and it was intimidating him??
Seriously, it amazes me why people throw Anything at runners/cyclists. I have never understand what the motivation and/or enjoyment is out of behaving in that manner - and I hope I Never do! Did you get DH to massage it for you??
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"