His initial "Terrahertz Chips" post was in response to Shinto Katana, who claimed that the PS3's processor will be "100 times faster than any computer out there."

Read the line of text at the top of each post. At the top of mine, it says "Posted Today, 11:50 PM in reply Lenny's post starting "blah blah blah." That's how you know who the other person is responding to.