Broken heart

That was our thoughts. But it drove up on the trailer like nothing happened.

Would a sprag allow it to do that?

Or did I just hit the wrong gear?

I would like to say I didn’t. But I can’t be for sure
What you described with the rear locking up or going into first and locking up can cause damage to the sprag. If the sprag is damaged or loose, it can cause a catestrofic fail under power as it shifts into second.