It absolutely can be saved, you've essentially just taken a cutting of it!
Two things that have helped me root Neps in the past:
1) Rooting hormone. Dip it at the point of the break in water, then in rooting hormone.
2) Humidity. I'd keep it bagged up so that that the plant doesn't lose moisture until it can fend for itself.
Not guaranteed to work, Nep cuttings can be hit/miss, but with it being the active growth point, I'm inclined to be hopeful. I'd also keep the remnants of the portion it broke off of (also bag it up probably) and see if it shoots out any basal shoots to make up for the lost vegetation!