[He nods, and gestures for her to follow, because Arwen looks pretty impatient.]

Yeah. It uh. When you have a big enough explosion, you rip through time and space. I don't know the physics, but it's called a Sario Rip. I guess maybe Sario discovered it? ... Anyway, we went all the way back to when dinosaurs walked the earth. The meteor crashing into Earth was what got us back. ... And wiped out a pretty nice group of aliens.

... I kind of... the others wanted to save them, but what happened in the past had to happen. And otherwise we'd probably never have gotten home.

[So yes. He killed the dinosaurs. Good job, Tobias.]