An interesting case. While I'm not acquainted with Texas branches of these families, I am familiar with the local variants.
Garza's tend to be very bright and reliable when their not having a "spell". When they're having a "spell" all bets are off. One I knew went all Fansome about '84. He went into a rage over a pop can on his desk being thrown away by housekeeping. Who knew you could create cold fusion in a Tab can? He didn't come back to work for a long time.
Hammons' are onery and have mean streak. I'm surprised Mr. Hammons didn't shoot the fella on the spot. That being said, any Hammons worth his salt, when faced with a crazy neighbor is going to mess with him. I bet Pop and the boy had a grand ol' time making him think they were peeking into his windows.
Great Uncle Claude Hammons would be proud.