Earlier, after removing all of the roofer's sloppy work, including his stacked little pieces of sheet metal he considered "flashing" (see earlier post, L-corner flashing), I had installed Grace Ice & Water Shield throughout, which was built up by working at the lowest lip, lapping onto the gutters, then lapping higher with each piece until meeting the existing roof. There, it was lapped again with flat metal flashing, which was tucked under the existing roofing paper.
This type of underlayment wraps all potential corners and edges from leakage, and relies on having the gutter already in place. It's an excellent system for an odd corner like this.
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