Completed, maybe not as intended... Spoiler So I got B to the end button and completed the level, but I did it by just giving him a push with the paddle across the water and then the second electric bot finished him off such that he fell on the end button. I understand how to get B into ghost mode as that is what I had to do repeatedly in your level Wolf Tongue and what I meant by my comment of the 26th of July: "You can make him hover to get back on [the platform], but at the expense of some serious brain damage." And I agree that it is a bit easier for some reason in this level. Perhaps the water has something to do with it. Still, I find it extremely difficult to navigate B in hover/ghost mode and will move on to other levels. I feel vindicated by having completed this level, even if it was a shortcut. Thanks!
Reviewing unfinished levels I finally solved this one. Tricky but nice one. Thanks! Spoiler: How I solved? I didn't use ghost/hover trick as I read later on comments. I pushed B into the pool. Zap kill him and tries to climb B. In that moment I push zap to the other side of the pool and he arrives to the win.