The frog jumped on him and Sam almost lost his balance in surprise. There was that a pause, and then it got away. He couldn't help but stare in the direction the purple creature had hopped. he recovered his balance and took a few steps towards his brother. He still wasn't sure what was going on but he knew pretty strongly that he didn't want to hunt that frog down until they knew more.
"Dean, it's not unheard of for something to turn people into animals in the City. Remember when you told me about the other me turning into a dog?"
Sam stopped and took a moment to let that sentence sink in because he could recognize just how crazy their lives were when a sentence like that wasn't the weirdest thing he'd ever had to say.
"I just don't want to gank that frog until we know more about what's going on around here."