I believe that there's some interaction between Heavy Pikes and prowling Wolves that causes a Ferret KTO. Occasionally in the Ember Caves section of Venus, a Heavy Pike will spawn in one of the caves, which players can use to their heart's content (or until they die, whichever happens first). However, while I've been able to play around on the pike for plenty of time with no issues, if I ever encountered a prowling Wolves pack and engaged them in combat I'd be KTO'd within a minute or two.

This has happened to me twice now - I know, not exactly a huge sample size, but it's the only KTO I've experienced in the past few days of playing and it's happened in the exact same circumstances.