He is traveling backward looking up at the ball coming down into his glove. I say the key to the photo is the butt, right side of the body. The outline of his uniform indicates his legs are spread so as to get stability for the position he is standing in. His right leg is back. If he were diving for a catch both of his legs would be pulled together and down toward the ground by gravity and momentum and the way a person would dive. There is no way his legs would be spread like that if he were diving for a ball.
To suggest its a horizontal card would be to say that he is diving for a ball with one leg up in the air above his head and the other leg down near the ground, maybe even dragging it. Not probable if you have ever seen anyone dive for a ball or do it yourself.
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