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Sounds like you'll be able to salvage it if you continue to grind without anymore over heating.

What I do is keep a bucket of cold water next to the grinder and dip the blade in the water after...

Why would you want to do that? There is so little material removed in a regrind that it wouldn't be worth the extra procedure or risk in re-heat treatment.

You would have more risk of warping (or...

If there was any color change to the steel, the heat treat has been altered.

You can try to scratch it with another piece of hardened steel, to see just how soft it became. Or just hone it up and...