Thank you sir. Not sure but I think we see two things happening, the Master Sword glows in the presence of evil, and the fused item appears just when it's swinging. Also, an unfused glowing Master Sword may be doing 60 damage instead of 30, at least that's how it worked in BotW.
Mr. @chesepuf showed that adding the star fragment acts as a speed gauge and helps keep the Railjet from despawning if you fall off and it lands far away. When it is leaving a trail you know you've got the nose either level or down enough for good forward speed. I also added it somewhat aft as a counterweight to bring the nose up faster if necessary. 🙏
