This Half Life foto contains
wrangler de caballo, wrangler, and caballo wrangler.
There might also be
camino de herradura, sendero de caballos, camino real, lippizan, lipizzan, lippizaner, lipizanos, lipizzaner, convention, caballo de silla, montar a caballo, montar, caballo de montar, and silla de montar caballo.
Youtuber user bloodrunsclear: "A long time request, based on the video game of the same name. I finally managed a perfect live action Gordon Freeman: Charlie Sheen from The Arrival."