Markets 
Brutal video obtained by The Post reveals how a gruesome, fatal subway surfing incident in Lower Manhattan unfolded.
The clip shows the 14-year-old boy and his 18-year-old pal on the top of the J train as it zoomed along in Lower Manhattan Friday – before one of them is struck in the head by a beam.
The footage shows both falling to the rails and ground below.
The 14-year-old boy was killed and the 18-year-old was gravely injured, cops said.
The younger teen died as a result of injuries consistent with a fall.
The older surfer was rushed to Bellevue Hospital in critical condition.
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