I find this happening to me a lot. A two stone group is surrounded and down to two liberties. You need to connect out, but an extension is too slow (and makes an empty triangle). A one space jump seems the only other choice... but will it work?
The simple case:
Seems good! But I seem to lose the stones a lot in similar situations.
If either A or B in the diagram is taken by white, black is in trouble!
As with anything, surrounding stones make a big difference.
Let me know if you have any other input on similar situations!