Glitches in reality.
They could indicate many possible things: Reality is not what you think it is. Or magic is real. Or your mind is being controlled by something else. Or the gods are up to something. Or you can't trust your senses. Or the laws of physics are being violated. Or there are more things in Heaven and Earth than are dreamt of in your philosophy.
Any one of these is a campaign or adventure idea, just waiting for you to expand it.
Commentary by memnarch (who has not seen the movie)
Oooooor I guess we could have Kylo help cause problems instead. Rey's definitely taken the lead over Poe now. It's a little odd of a choice to have Kylo Force Phonecall at this exact point, but I suppose there's context missing from the previous Kylo scene that I didn't get. Maybe something about really really really wanting that lightsaber Rey is carrying.
Kylo is definitely proving Maxim 29 applies here. Like, what's Rey supposed to think now, huh? Assume for some reason that she won't get back-stabbed if she ever teamed up with Kylo later after he took the necklace like this? Pete definitely would expect that though, so maybe that's why he's so insistent about not working together. It saves time on the inevitable betrayal and Kylo's got more resources at the moment to deal with betrayals anyway.
So was the point of the seed husk necklace to get yanked away like this? Just to show that Kylo can teleport small objects? Why not simply teleport the lightsaber instead? I would assume that he'd try and teleport Rey as well if he could, but disarming her would be just as good. It'd make for decent bait to draw Rey to him if it's really as important as all those panels made it out to be.
Transcript
Kylo Ren: I reach out through the Force to Rey.
GM: <roll> Rey, you feel a now familiar presence.
Rey: Oh, geez. Can’t I divert to voicemail?
Kylo Ren: Rey. You want to destroy Palpatine, don’t you?
Rey: Mmmaybe... What’s it to you?
Kylo Ren: The enemy of your enemy is your friend.
Rey: You still on this working together kick? Never!
Kylo Ren: Do I see any hints of Rey’s location? Shadows? Wind?
GM: She’s wearing a strange necklace.
Kylo Ren: Hmm. Sea water came through this Force connection when Rey was on Ahch-To, right?
GM: Yes.
Kylo Ren: I grab the necklace!
GM: Hmm. Make a Force Pull roll at -4.
Kylo Ren: 16, adjusted to 12.
[SFX]: grab!
GM: You snatch the necklace, snapping it from Rey’s neck.
BB-8: Whoa. He wrong warped the necklace from your inventory. The Force does speedrun glitches now!