Cal,
You need to explain exactly what happened.
What you heard, felt, smelt & saw.
When a pulley jambs oft you get a burnout on the belt at the engine pulley.
In that case the belt gets too thin in one spot to drive, so you go nowhere.
Very rare to damage the pulley to the point it won't drive at all.
Very easy to get the belt on the wrong side of a belt keeper, particularly on that back pulley.