So when Frank heard (over the radio) that his son (in the future) might be killed by this guy - he tried to kill him in 1969 so that event (over the radio) could never happen. However, he only succeeded at shooting him in the hand. If he didn't hear John being in danger over the radio, he wouldn't react as he did, the murderer wouldn't get distracted by the radio, would kill his wife and walk out free. Which might explain the 1999 scene with his hand still intact and John's mother dead. I think the murderer got distracted by his own voice over the radio, as well as Frank who reacted differently because of what he heard. Not to mention the little John who woke up, probably because of the radio noise.
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