[Yen]

If you constantly warp between a level that's a no PK zone and not a no PK zone, the level that isn't a no PK zone will be treated as one.

Basically, if I step on a link to a no PK zone and hold up+down, it'll move me between the two levels incredibly fast.
When I let go of up+down, I'll be in the PK level, but it will be flagged as a no PK zone, thus preventing other players from hurting me.

This is an incredibly bad bug. It really, really needs to be fixed.