Hello!

The ninja trait, Fleet of Foot, grants the following:

Increases movement speed. Effect nullified if suffering from wasp or viper venom in a PvP area.

Of course, one would assume at first this means that your movement speed is reduced if you're currently using wasp/venom on your weapon. But the way it is worded, with "suffering", could mean that the speed is reduced if you're hit by another ninja. In which case there is no way to tell if you're "suffering from warp or viper venom" so that doesn't leave a debuff