My curiosity just got the best of me and I just did some research on the Trem King. The reason why the B string on helle man's Trem King/Hipshot setup is unaffected by the trem bar is because the Trem King bridge is screwed directly to the top of the guitar in a fixed-bridge fashion. Only the tremolo block underneath the bridge moves, not the bridge itself as in a traditional Fender Strat trem.
Strings that do not pass through the Trem King trem block are unaffected by the trem bar. In order for the Hipshot B-Bender to work, the string must pass through it and not through the Trem King trem block.
Because of this, only the remaining 5 strings are affected by the trem bar. This can be interpreted as an advantage or disadvantage depending on the player's requirements. It's pretty subjective but hey, this is a pretty unique setup and very clever too.
Here's a link to Trem King's site and a couple of videos that explain the nitty gritty of the Trem King system:
http://tremking.com/vid.html
Please be patient as it takes a couple of seconds for the second video to appear. That's the one that really explained it for me.