You may also know me as "trevjamsey" my older username. I'm a modder for Half-Life as well as the Fallout and Elder Scrolls series. I have a Youtube series that showcases the best HL2 mods the community has to offer, at my channel "Xlayer trevjamsey"
Every Spider has a 1% chance of spawning with a skeleton riding it. I was lucky enough to spot this one just outside my home moments before the skeleton burst into flames.
PS. the widescreen makes this image look small hit "view original" for better quality