Okay. It seems that the pony is just as startled by Jack as he is of it. He holds his hands out, and actually takes a knee to get closer to Fluttershy's level. Well, he heard it talking earlier, and he's going to have to assume that it has the same level of intelligence that they all did when they were ponies.

"Um. Hi. Sorry I scared you. Please don't run off, this isn't the safest place if you go off the path." He looks a little worried at the idea of accidentally scaring Fluttershy into actual danger. "My name is Jack, who are you?"