As you guessed, this was not a natural occurrence through accidental injury, not being the intention of players normally to break the bones of their opponents. This is a sinister intrusion by extraterrestrial energy to cause the injury. It is something done at regular intervals to rig sporting contests and to punish particular teams, especially who the extraterrestrials dislike, and for the latter there will be a greater than usual number of such casualties generated in order to give that team a hard time as well as punish its fans, to discourage their support through repeated failures to win games, because of such manipulation to put obstacles in their way.
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