Nozzle disconnected itself from heater/extruder during print

I replaced the 0.4mm nozzle with a 0.6mm nozzle. It printed fine for 1/2 the print and then apparently disconnected itself from the print head/extruder. It no longer seats electrically and I can't re-seat it due to the resistance from the filament. So...I can't remove it because it won't heat up due to not having any electric contact.