Last evening about 6PM I got a call from someone who could hardly speak English who wanted to see my house (for sale by owner)........
I live in an area north of Reno called the North Valleys. Homes in my neighborhood are 1 acre lots. There have been many homes for sale for a long time and a high percentage of buyers are Hispanic whose language skills range from zero to excellent. Mostly good folks who like horses, keep to themselves, and are family oriented.
If somebody is coming to look at your house, then it's logical that they'd be a couple. With English skills sorely lacking, as in the case of your prospective buyer, the "Spanish jib" you described may have been an attempt to communicate after being threatened with bullet holes should he not show up alone--especially if he was on his way with wife, mother-in law, and all the kids--with everyone eager to look at their possible new home.
You were quite correct to be on alert and suspicious, but, under the circumstances, you might have, from the start, asked him who was coming with him, what kind of car did he drive, etc. Sounds like the kind of thing that could happen with someone who "barely speaks English".
What are the chances that language barrier was the problem? I don't know, but I suspect a lot more likely than gang bangers who want to gain access to your home through trickery and rob you--- or worse. I'm not saying you were wrong, just that you might have left out the bullet hole part.
If something similar to way I described was the case, it might have been who called the police in stead of you. Guess we'll never know if you saved your lives or just scared some people looking for a new home.