Charles is only going to arrive at the Coliseum with intentions of getting his fiance. After that he will do his best to try and help keep people alive with however little his abilities work. If you'd like your character to get help from the telepath, let me know!

Caius is going to be severely affected by this in ways that will trigger PTSD from when he was a gladiator in Rome's Colosseum. But he'll push that aside while trying to protect Margaery (with Oberyn) and others until they, or he dies.