Well, I will attempt to explain. Right now the 'branch' has received an extreme shock. The branch needs 'moisture' right away to stave off the 'dying' process and with the breakage immersed into water assures all newly exposed parts are covered. Most especially since the branch has already blossomed and fruit has begun to develop.
I have stuck new broken plants into wet soil and they survived but there were no blossoms/fruit on them. The weather was mild both day and night. I cannot promise the branch will survive, but in water one can observe the root process begin and IF they develop then the new plant can be placed into the soil.
Appreciate your help.
Thank you.