ok ok; quiet down now and i'll tell some more of the story. first, i no longer have clamps big enough for this job so i had to wait to borrow some. ironically, they're new construction but that's another story.
when i earlier noted "new construction" i meant "won't notice the flaws going by on a galloping horse". the leg is cut from a blank made up of no less than 3 pieces of wood edge-joined with only glue. the break broke across one board at one of the splices. the intact "hinge" is actually the thinnest part of the splice & illustrates the old adage that a good glue joint is always stronger than the wood. i have added a red arrow to the photo that points to, and is at right angles to, the splice.
it is because the grain direction in the upper (upper in the photo) piece of the splice is so skewed from vertical
and skewed from the more vertical grain direction of the lower piece, that it broke. hidden under the clamp board on top is a void i'll have to fill, but on the downward edge and interior to the void is about 1/8" of stain which indicates to me the board was already cracked when the piece was finished. giddyup!
well, i'll leave off & let y'all chat it up some more. always wear ANSI approved eye protection when working with tools and equipment.

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semantics is not always just pedantic quibbling. ~ douglas r. hofstadter