Many of my trees had been budding out when the last big freeze came to Texas. I feared the worst for my mini-plantation of about 45 trees. Several have definite winter damage to the tops and a couple sprouted up from the pot next to the main trunk. One in a 2 gal container shows no sign of life (I think it's an RdB, too).
My original RdB had been put in ground last spring and did not do as well last summer as it did the previous summer. It also had just started budding when the last freeze hit. After that, there was no signs of any buds, while it's sister at a friends house has leafed out already. My joy was complete when I found a small shoot coming out of the ground next the the old trunk!
The lawn guy cut it down the next day with the weed-eater.