Caught my son watching porn

I accidentally walked in on my 15 year old masturbating to porn... I knew right then I needed to have "The Talk" with him. Yes I know I'm late. I've honestly been trying to avoid it.... It's just too awkward. Today I decided to try and it didn't go that well. I sat him down and told him it's normal to masturbate and he put his face in his hands. I then told him his body is doing some magical things and he's becoming a man and that he doesn't have to talk. Just point to a part of his body and I'll do my best to talk to him about it and he said "I swear to God if you don't stop talking I'm gonna fill my pockets with rocks and walk into the deep end of the pool!" So that was how that ended.... Well ... Guess I messed that up