premise: Copley will start Wednesday's game in Winnipeg. Wednesday's contest was meant to be handled by Washington's primary netminder, Braden Holtby. However, prior to puck drop, it was announced that Copley would get the nod and the Capitals would be forced to dress an emergency backup behind him. Meanwhile, Holtby (upper body) has been ruled out for Wednesday's road affair, which happens also to be the second night of a back-to-back.
hypothesis: Holtby was ruled out due to chest problems.
reason: He was ruled out due to something with his upper body, but it's not stated specifically. It could have possibly been his chest, because the chest is part of the upper body. The system might think that "upper body" is a specific thing and not a general category, so this might have been difficult for that reason.