Did you just hold it in water at that spot or did you move it up and down in the water?
If you just held it steady you may have a "water line break" issue.
Else you may have an alloy that shouldn't be hardened in water "tool steel" is rather meaning less as there are hundreds if not thousands of tool steels out there, some harden in water, some in oil and some even harden in air!
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Thomas
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