Honeysuckle with severed stalk

I had a well established honeysuckle vine growing up my pagoda next to the rabbit enclosure and unfortunately one of the rabbits bit through the stalk of the honeysuckle. The plant started wilting almost instantly and after putting the severed in water I managed to regain a little life to it. I happened to have some Potassium Nitrate fertiliser lying around so I put a teaspoon of that in the water and it seemed to help. It's been a few days since the stalk was first broken and despite my efforts, it's now getting worse by the minute. I knew of course that soil normally has lots of nutrients in that the plant can't get from the water so I tried adding various fertilisers in small amounts, but now nothing seems to work. I've heard honeysuckle is easy to root, I have some rooting powder but nothing seems to work. To some extent the fertiliser made it worse. I've put it back in just water now. It's been growing 3 years to get where it is now and am really keen to keep it from dying! I've attached a close up of a leaf on the plant, any help would be very much appreciated, I have literally no idea what to do. Thanks in advance.

 

to GC @Hendocal

So, you have taken the severed part and you are trying to entice it grow? I'm going to assume then that the actual plant is still in the ground (the main roots?). If the main plant is still in the ground and, as you say well established, it should grow back.

I'm not experienced in rooting from cuttings, but I'm sure another member will be able to offer advice on that.

 

the problem is that it is the main plant which has been cut off from its roots. whilst the bit remaining that's still in the ground will grow back, it will take a long time to get back to where it was since it is only about a foot length of stalk with no leaves, will it not?

 

The whole top half of the plant has been bitten straight off from the stalk going into the ground and roots (which is still there), I'm trying to get the the top half to grow roots from the severed stalk so I can keep the main plant alive.

 

@Hendocal
You don't say how big the honeysuckle was.
It is unlikely that the top part of the plant will survive and I would just discard it.
The stump will probably start to send out shoots in a couple of weeks. If it was a well established vigorous plant it could well grow back to almost the size of the original by the autumn, especially if it gets some TLC. A good watering in dry periods a sprinkle of a general purpose fertiliser around the root area and a layer of compost or well rotted manure around the base. Also keep the rabbits away.
I've pruned honeysuckle back to almost ground level at this time of year and been surprised how quickly they come back.

 

Wow, grow back by the autumn? That's certainly very reassuring to know. But there's definitely no hope for the main plant? It was quite large. Probably 4-5m in length if you straightened it out. Thanks for the help though @NigelJ