re: Torpedo grass…..

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No I nuked the area with roundup. 3-4 times over the last month.

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I sincerely hope you never see it again. I really do. And you might not for some time, maybe even a whole year or more. Then when you least expect it, you'll see that one blade emerge again, and you'll feel that lump in your throat. I hope I'm wrong. I'd have a hard time being confident unless I did what you did and then excavated the whole area a few feet deep in an attempt to remove all traces of it. But that's not really practical. You did the best you can practically. Otherwise, just have to hope for the best.

While you have the dead spot, if you don't mind having a bare spot until next year, you could try a residual/soil sterilant herbicide. That would be an extreme measure not intended for home use, and maybe an consideration if there's a "next time". This is an example:

Pramitol

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Pramitol 25E is a non-selective pre and post-emergent bare-ground herbicide concentrate popular for industrial and commercial applications. Bare Ground means exactly that, wherever Pramitol is applied, nothing will grow for one year or more. Apply before or up to three months after weed emergence. Dilute in water or oil and apply as a foliar application, before construction, or in or under asphalt to control johnson grass, bindweed, wild carrot, and other hard to kill weeds and grasses. Pramitol 25E will not control woody vegetation. Pramitol is ideal for use around buildings, storage areas, roadways, airports, highway medians, lumberyards, pipelines, fences, recreational areas, and similar areas where total weed and grass control is needed.

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This is another. You can further research these types of nukes, as they may require licensing to purchase.

Barren