What part do you need exactly? Do you still need to get the gem? Or is it during/after a specific scene like the baths or the rooftop?
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No, you should be able to skip as long as you haven’t seen the scene already. I went through tested different choices, and as long as Rune has the gem after his Training session and throws it at you, you catch it, and Alon is there at the baths, you should get the scene. I also tested to see if it was because of who you choose to save, and that has no effect on the outcome of the scene, just the Ending scene right before the credits.
There is a way to do both. If you have already taken Alon’s bet and won, you should have an option to invite him without having to do his scene. If you have unlocked it, it would appear right after you activate the automatic shot for the cannon [Let’s give it a try!]. Another way of doing it (and I don’t really remember how to unlock it) is get another option to appear when you get ready to [Sit down with your friends], the option being [duck under the table] in EARLY MORNING. That is another way to get the gem. I can share my route (with the options only so it doesn’t spoil) if you would like!