Segments of leaf tissue can be removed at any time when removing/ amputating bad tissue. Just ensure exposed wounds are cleaned and sterilised. Some use cinnamon, i use bleach or hyd. peroxide and more often than not wip out my cig lighter and seal the wound with naked flame, a method come vital with me for many species precious bulbs etc- peristeria, gongora etc. Cell membranes all over leaf, keep close observation may require full removal depending on future results, maybe just fine bar a bit disfigured, not permanent though will soon be outta sight outta mind.
I repot any orchid anytime bloom or not esp. phals. Would deal with bud blast, still has a future, sphag is a slow murder