A man is writing a letter. The power goes off and he dies. Why?

Common Wrong Answers
“He was struck by lightning”
While lightning can cause sudden death, there's no direct connection to him writing a letter or the power going off in the context of the riddle.
“He had a heart attack”
Although a heart attack can happen at any time, the riddle specifically ties his death to the act of writing a letter and the power going off, which isn't explained by a heart attack.
“He was in a blackout and fell”
A blackout could cause a fall, but the riddle implies a more direct connection between writing the letter and the power going off, which suggests he was in the air, not just in a building.
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