Yeah, cutting just a little into the new growth is ok. those back bulbs look pretty healthy so even if (and i'm just saying) you lose the new growth, they should push out new plants easy.
(Gulp) Lose the new growth?!?! I agree though, better the growth then the whole plant!
Believe me when I say that that's the right attitude. I lost a few plants hoping that the rot would not continue even though a very tiny amount of infected flesh was still attached. Now i prefer a healthy backbulb over an infected new growth (but if i can save it for sure i will).
Well, the only way to know for sure it to try hacking into it again and see. I needed to get back at it to repot it anyway and trim out the old dead roots. There is alot of old mix stuck in that mess of roots. I will just trim back further and see what happens. That bulb was really gross though...a bit stinky too. The bugs were really loving it!