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Seems entirely reasonable a player's eye can be affected by a jacked up hand. As you expalined very well hard hit balls turn into soft hit balls, or fouled off. Tough strikes can't be fought off as easily and instead are swung through. Hitting is so hard that the smallest thing wrong can have a huge impact. Hands are right up there as the most important thing to have healthy. Kinda like me trying to shoot some jumpers with my son last night at hoops practice with what is looking more and more like plantar fasciitis or a stress fracture in my foot. Not as pretty as usual!