Check this out before you throw too many stones at that smart, if not fatally brave, border cop. I expect I'd have looked for the best defensive position or all the help I could find, and I'd hope most Marines would too.
Of course, if we can sucker the Mexicans into a minefield, an impact area or beaten zone, or the place where our snipers are waiting, so much the better. Teasing the enemy with live meat worked for Sitting Bull asgainst Custer, and probably for Geronimo anf Juh against the Mes'kins more than a few times.
-archy-/-
Ok, keep the agent, but send in the Marines anyway. :-)