We had an early field of beans last year that got hit by frost. It was 28.5 deg. F for a couple of hours and the leaves turned black on some of them. Others were OK. Some of the ones that lost the leaves went and set 2 branches and kept growing. Some died. Field yielded very well. I think we lost about 10% of the stand.

Watch and see what they do after the frost. 33 isn't frost , so you may be OK.