That's gotta hurt. I took a ball to the side of my face while sitting in the stands/bleachers at a local soccer game and it knocked my sunglasses about 15 ft away and I saw stars. I cannot even imagine a ball to the face straight on. *cringes*
Yeah as you mention hands aren't normally used in football with the two exceptions being a throw-in (used when the ball has gone out of play at the sides of the pitch) and the goalkeepers (as long as they are in the area around the goal).
I'm guessing the bloke in the blue is stood there to prevent a long throw being taken and to otherwise cause a nuisance, although it is unusual as I have never seen a throw-in taken like that!
Leave it to my daughter to figure out why he had the ball in his hands.....that was a 'throw-in" from the ball going out of bounds. The only part we can't figure out is why the blue guy is standing there. By the ball bouncing off the blue guy, it just meant another throw-in for the white team. Wonder if he stood there for the next throw-in? LOL