User blog comment:AltertheSilverBird/Total Drama: Danganronpa Chapter 8: Class Trial/@comment-26184706-20161002221849

Actually, after going through the evidence, I think there's a chance that Geoff made a mistake. According to the file, the fall was the cause of death. Geoff must actually think the blow caused by the surfboard was what did him in, after all he is one of those contestants who would overlook that despite being told several times. The file also mentioned a bump that was not a result of the fall. I suspect Bridgette hit Topher causing that bump, and after assuming he was dead, Geoff knocked Bridgette out to give her an alibi, threw Topher off the tower, and put then suspicion towards himself; unaware the whole time that he directly caused Topher's death.