I don't think I've ever actually seen Furinji fight at all in either the anime or the manga. Just, everyone talks about how badass he is and compares him to a weapon of mass destruction. The chairman, on the other hand, got beat by a chimera ant, I think? I gave up on HxH during the chimera ant arc because the show just kept dragging things out. Seriously, 8 minutes of rehashing the previous episode, 3 minutes of op/ed, and 2 minutes of previewing the next episode was a bit much for a 23 minute long show.