I wouldn't worry about being banned if your playing on console. Blizzard can't ban you for the same reason they can't do anything about modders and hackers on console. Exp is shared, and more than likely, that 10k paragon player had a modded gem of ease that was leveled (hacked) up several hundred levels so the exp gained per kill is insane. The only advice I can give you as a fellow console player is to always stay out of public matches.
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I wouldn't worry about being banned if your playing on console. Blizzard can't ban you for the same reason they can't do anything about modders and hackers on console. Exp is shared, and more than likely, that 10k paragon player had a modded gem of ease that was leveled (hacked) up several hundred levels so the exp gained per kill is insane. The only advice I can give you as a fellow console player is to always stay out of public matches.