cranked while engine is running=BAD!

I got back in the jeep and forgot I had left it running. I tried to crank our 99 sport and it was already cranked. Of course it only took me a millisecond to realize it, but it was too late. I cant remember if I heard that sound and I was beside a loud backhoe so I probably wouldn't have heard it.



Now nothing happens. It wont crank, the gauges don't move, the lights don't come on. Is it a fuse? If so what fuse? My Husband checked the little fuses and they all appear good. He doesn't know how to check the fuse for the starter.



My husband asked me how itstopped? He was trying to determine if it just cut off on its on or did turn it back with the ignition. But I don't remember exactly. My husband asked me if it made that noise but I was by a loud backhoe .



What will happen if the engine is running and the ignition key is turned?



I have seen many people do this before with no repercussions. I have done it in my Ford before with no problem I don't know what happened?



Any and all help appreciated.



Thanks

Granny DP