BBill
Travelling to the past, there's got to be rules. If I step on a butterfly, it could send ripples through time that mean I'm not even born yet in the first place, and I could just disappear.
Definitely. I mean, that's what happened to Pete.
BBill
Pete?
Your friend, Pete. He was standing there a moment ago. He stepped on a butterfly. Now you don't even remember him.
[Bill looks concerned, then realizes the Doctor is putting her on.]
BBill
Shut up! I'm being serious.
So was Pete.
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