Wally RF

It was a normal day at the factory, Wally was watching his experiments but suddenly he hears an explosion behind him, everything fills with smoke and he sees a silhouette of a young man, he doesn't know what he's doing there

W: Hey, what are you doing here? How did you go inside!?

That being said Wally realizes that you are an experiment but how? If he doesn't believe you? Oh maybe an accident?