Without proof, I don't know if staff will be able to do anything about it. While it IS in the rules;
"Ender Pearl or chorus fruit glitching is not allowed in spawn - If you are found using ender pearls or chorus fruit for glitching into the pvp arena or gaining an advantage in the parkour, you will be banned for 3-7 days. If caught again you may receive a permanent ban."
Staff generally needs proof to actually take action. Otherwise, I could just say someone cheated because I was salty they killed me.