Something like that. Encountering yourself when you're not supposed to creates a paradox, which can create a hole in the space/time continuum the size of a small country. [He says this rather matter-of-factly, as if creating a black hole via paradox was the same as commenting on the weather.

While the smile remains, it becomes a sadder smile.] Ah... yes, I suppose I would be, wouldn't I? [He shakes his head in reply to the question.] No good, I'm afraid. Events that are locked in time are not only incapable of being traveled to or messing with, but are behind that lock for a reason. I vaguely recall the theory regarding time-locked events--that they're separated from the rest of the timeline for a reason. Whatever this reason might be...

[He has a few ideas, but there were only whispers and recordings that could tell him about the event he thinks is behind that lock.] I'm certain whoever put the lock in place had a good one.