Is the plant in a container? How cold did it get? How long have you had it?

In the meantime, don't prune anything until the threat of cold temps. passes. The burned foliage can provide some protection.

If your area had some unexpectedly severe temperatures, plant losses will occur. Factors such as soil moisture, protection, maturity of root system, and more will determine a plant's ability to tolerate the freeze.

That makes sense because the folage underneath is still very thick and green. It is in the ground and was planted this past spring and has grown to about 8 feet tall and very dense. It looks fine except for the frost damaged outside limbs.

I am hearing that the coldest part of out winter is still ahead so I would not prune yet. These are hardy for most winters in Austin but it did get killed off in 2011 . It usually gets burnt back in Z8b and grows from the ground.

If you purchased this so you would have winter flowers, you might want to consider investing in some heavy weight spun-bond row cover such as Agribond. On nights when freezes or frosts are predicted you could wrap the plant in a couple of layers. Particularly if it is in a sheltered location such as next to a building or if you add a string of holiday lights under the row cover to add a bit of warmth, it might save your flowers and reduce the branch die-back.

here in MI ... when i get frost or freeze damage on various plants ...... i give the plant AT LEAST.. a month.. maybe two .... to get its act together.. before i go cutting on it ...

often ... its just leaf damage.. and the branch itself.. can releaf ...

but how that all works in TX .. in winter .. with a winter blooming plant.. is beyond me ...

ken