Lesson learned, but was it the right one?

Today I gave the girls each a stick of string cheese. Riley starting taking bites off hers right away. Samantha, as is her style, bit right through the middle, so now she had two pieces. They both went to sit on their little couch while I checked email.

Then the howling began - Sam was screaming bloody murder. Thinking she had been bitten by Riley again I jumped up only to catch Riley giving me a guilty look as she handed one of Sams pieces of string cheese back to her.