How was Hashirama in the reaper death seal in Naruto?

The Reaper Death Seal, initially created by the Uzumaki clan, is one of the few forbidden jutsus in the Naruto universe.

How was Hashirama in the reaper death seal in Naruto?

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100+] Reaper Death Seal Wallpapers

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How Did Hashirama Die in Naruto?

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Reaper Death Seal! - Leaves in the Wind: Hashirama's Will

Is teenage Minato, prime hashirama level???? : r/Naruto

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The Legendary Shinobi That Killed Hashirama Senju - Death Of The First Hokage Revealed

Who is Butsuma Senju in Naruto?

I can't stop obsessing over how Hashirama Senju could've met his end.. : r/ Naruto