Go ahead and try, it won't hurt. I only have a couple that will not eat during blue. The ones that do, the worst that happens is their aim is off and they miss a time or two. But, they do eat. I have two in blue right now and they both ate last night.
I am assuming you are feeding F/T. If you are feeding live keep a close eye on the prey so it doesn't injure your snake as its vision is obviously impaired.