Do the STSF effects "normally" go away after a certain amount of time or something ~without~ the edge?

Because usually for me, fighting STSF warriors as a melee class I can hold out a bit in the beginning, and then really can't fight them for the rest of my login session without getting pwned and flee-blocked to hell. That's the worst thing, IMO- basically having to run like a puss until the next login session. Shouldn't the charges go away after they fight someone else or after a timeout period (or maybe the do..)?? At least them dying should reset the charges you'd think but I'm fairly certain that isn't even the case.