The spiral triskelion shape is closed. The putty sealed the shape so when he poured powder into the tube the putty prevented the first powder from getting inside the shape. Once backfilled he removed the putty from the sealed shape and filled that empty space with a different steel powder to create the contrasting Damascus look.
That would have made the job more difficult, trying fill specifically the inner spiral and not spilling it as he placed it in the tube.
I am super confident this person has a lot of experience and is doing this the easiest way. People who fabricate things put a lot of thought into making their work easier and more efficient.
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u/SeedlessPomegranate 4d ago
What was the point of the first step? The part where the putty was put on?