When running Last Wish with my team this week, we noticed that two of our teammates could not shoot the laser when holding the crystals at the Shuro Chi encounter. After a bit of trial and error, I noticed that both of the guys with the problem had blue nightfall auras over their head (these are created when equipping specific nightfall emblems if you didn't already know). After they unequipped the emblem, they were able to shoot the crystals again. We didn't check if the problem happens with other auras, but I wouldn't be surprised if it did. If this has already been talked about, great, but we just wanted to get this out there in case anyone else was having the problem.