What is Second Rebuttal in debate?

The team that gives the second rebuttal has two jobs: answer the opposing case, and rebuild its own case against the attacks just made ("frontlining"). On most circuits the convention is that second rebuttal has to respond to turns and major offense, because summary is too late. That makes second rebuttal the hardest speech in PF, four minutes of pure coverage, and it’s why frontline prep and word economy get drilled so hard.