Elle: Chemical accelerant could mean chemistry student.
Reid: Could also mean chemistry professor.
Elle: Mmm, I say student. You need self-confidence to lecture in front of a oom full of 30 college kids. Arsonists are socially incompetent. This guy doesn't go on dates. He doesn't go to parties. He doesn't feel comfortable in front of groups.
(Reid stops and looks at Elle and she looks back)
Elle: And, of course, he's a total psychopath.