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.

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Minato Namikaze / Reaper Death Seal by Robert-Sennin on DeviantArt

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

How was Hashirama in the reaper death seal in Naruto?