How does Phineas respond to the accusations made against Gene?

In Chapter Eleven, Brinker and pals rush into their room and drag them out to the First Building, which Brinker still has the keys to. Brinker, who is far more obsessed with Finny's accident than either Gene or Finny are, is holding some kind of inquiry into the accident, with a few other boys there to act as an examining jury. Brinker brings Leper, who was at the scene of the accident, out to speak; when Leper says that Gene did indeed push Finny, Finny freaks out and runs from the room. He falls on the marble steps outside, and re-breaks his leg.