OMG!

I would have totally freaked out on him!

Seriously, they would have been calling for a manager and security on me!
What did you do? IMO, those ages are too young to be going alone on that kind of ride.. What the heck was he thinking?
ITA I am not one for causing a scene but that is far too young for two children to be left alone on a ride in the dark. They could have easily slipped out of the buggy and a serious accident could have occurred. I I definitely would have lost it as would my husband. I would love to know his reason for not stopping the ride.
In hindsight, I should have stood there and screamed bloody murder until he stopped the ride. I think I was in shock and numb from disbelief.
The CM that tells you what car to get in, sent us to a car too far forward on the moving platform. I was letting the little ones climb in before I got in. DH and DS who was 6yo at the time got in the buggy behind us. After the kids got in, I was all set to climb in when the bar came down. I tried to pry it open, thinking it was going to move. It was locked solid. My brain would not register that fact, so I kept trying to pull it open, determined to get in with the kids. Meanwhile, I am being pulled toward the tunnel. I was not letting go of the car. As the buggy entered the tunnel, I realized I had to let go, or I was going to lose my arm. I let go, and that's when the screaming started. I yelled to DH to watch them, and turned to the CM at the controls. At this point, being in shock, I wasn't even thinking he could stop the ride (though he can, because it gets stopped constantly to let handicapped people on). I was just thinking I need to be at the exit when they come out, they need to see me as soon as the ride finishes. I asked him how do I get to the exit? He just grumpily tells me I need to ride through! I NEED TO RIDE THROUGH???? I yell again, where's the exit?? He tells me to ride through. I am shaking at this point, but jump in a buggy. so I am now about 10-12 cars behind my kids. I am freaking out the whole ride...let me tell you it was the LONGEST HM ride I have ever taken. My imagination was running away from me. I kept envisioning them climbing out of the moving car.
I finally made it to the exit, and I see DH was holding our sobbing 2yo DS and my 4yo DD was standing at his side. As soon as she saw me, she started sobbing "Why did you leave us?" I started sobbing myself, scooped her up and told her I never would have left her. We walked out with me and the two kids sobbing and sobbing. I sit down on the bench just outside the exit trying to get it together.
Someone must have noticed that something was wrong and reported us, because the manager of the ride came over and asked us if there was a problem. Boy did I go off on her! They are 2 and 4 years old and they were sent through ALONE! I pointed out that on every ride in Disney there is a sign that says no riders under the age of 7 can be alone, and they were 2 and 4!!!! Oh boy was I a mess. She apologized and told me that it never should have happened. It was unacceptable that the CM did not stop the ride immediately. She offered to let us ride through again which I thought was a very good idea, as I didn't want that to be the last HM experience for them to remember.
So, the kids agreed they would ride again, as long as I stayed with them. She offered to stop the moving platform for us, so they wouldn't be scared. She then escorted us right onto the loading platform FROM THE EXIT TUNNEL!!!! Amazing, but yes, you can get to the exit from the loading platform. hhhhhmmmmmm.
Anyway, we rode again, I made it a point to tell the kids how silly the ghosts were and they had fun.
The one it affected the most over the years was my oldest DS. He was very troubled that they went through alone. He would bring it up for years.
I did make a phone call to complain when I got home and Disney did contact me to apologize, and from the sounds of it, I think that CM found himself without a job. You know what? I didn't even care.