It's also incredulous when you compare the two stories. Vasquez was less than a minute behind Juarez et al in chasing Aldrete to the ditch. But Juarez says when he arrived, he went down in the ditch, saw Aldrete, saw Compean, saw Aldrete cross the ditch, watched an altercation, saw Aldrete and climb to the top and run past Compean, saw Compean fire shots, etc. and then casually walks back to the top of the ditch by the van. Vasquez says Juarez was "just standing there" by the van when he arrived. That's a whole lot of activity and movement for less than one minute. And Juarez never ever mentioned a thing to Vasquez. The story doesn't add up.
"I simply found it incredulous that the two agents at the van heard gunshots but did not respond."
It is unrealistic isn't it? The only explanation is they knew Compean was firing at an unarmed target that was far away and almost back to Mexico.
There is no other explanation for their behavior.