I am working on a double stack 8" cake.  I had buttercream on the cake.  I obviously rolled the fondant too thin and when I put the fondant on the cake, it tore - too badly to repair.  So I pulled the fondant off and there was buttercream stuck to the fondant.  Not a lot because I didn't have a lot on the cake.

Before making a failed second attempt, is it possible to do anything with that fondant in order to be able to reuse it or do I need to start over with fresh fondant?  I think I already know that answer, just hate starting all over with new fondant - and coloring it .... and well, you know what I'm thinking.  Argggggg.

AI usually scrape off the buttercream (a little is ok) knead it, let it rest, re roll

Yep, a little bc in the fondant isn't going to hurt anything.