Sounds an awful lot like a seized/galled thread to me. Be patient and let it soak, and then work the bolt back and forth to work the penetrant into the threads. Hopefully it will come out without too much damage.
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2000S Ocean Blue Metallic- 116K
3X Water Pump, Clear side markers, Crios Mod, Front engine mount, Flywheel, clutch, RMS, AOS, MAF, serpentine belt, power brake vacuum line, battery, 2X CV boots, Fuel filter, Oil filler tube, 3X ignition switch, 90K service, gas cap, Coolant tank
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