Styptic pencil or powder, quick stop are ideal. But any powdered substance plus direct pressure. It will stop. Don't keep stopping pressure to look at it, you disrupt the clot. Just keep pressure on for several minutes. Then keep the chicken quiet for a while, in the dark or in a cage so it doesn't scratch around. It will be fine.
you just have the tube ready, blot the blood, then drop a drop on the quick opening in the nail. It's basically the same as surgical glue and works great. I've used it many times when flour or corn starch wouldn't work. You just have to be careful not to glue yourself to the chicken