Yup is a new koxp that does something like additional damage to you and it never stops until you die. It happen to me too in ardream.
I was runnung after by a k.o.xper in bowl, i towned and then while i was in town and he was at bowl, i was potting for 2 minutes to break the damage till i died because i was out of pots ^^. you probably lost exp because you tp to another zone.
So basically to survive from this you have to quit game or end knight online from task manager ^^.