I overheard them. I am good at overhearing.

Leo: I was at the mall and the fire alarm went off! Someone said there was a bomb or something.
Yaroslav: I was there too (I think that's what he said).
Sebastian: When I was 4th grader, my friend cried when the fire alarm went off because of the fake bomb; it was so funny( That's what he basically said; his story was actually a lot longer than this).