The Red Sox and Astros had an issue during Game 5 of the ALCS in Boston, when a mysterious light flashing appeared in the outfield before vanishing... Umps got together and there was a longer explanation Post-Game which you can see/hear all of here!
here's the other side of Wall where there is a Bar at Fenway Park w/ a Camera Crew filing a segment accompanied by a bright light (that shined through)
allegedly there was ANOTHER incident Red Sox Manager Alex Cora brought up to Umps about a different light shinning from the Outfield that turned out to be a piece of reflective tap on the Wall...
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