Witnesses have described to Making Star Wars a scene they saw play out, staring Kylo Ren (Adam Driver) and six or seven other members the Knights of Ren taking on Rey (Daisy Ridley) and Luke Skywalker (Mark Hamill). If you're not familiar with the Knights of Ren, they're Supreme Leader Snoke's dark side cronies whom Rey saw in the vision she had when she first touched Luke Skywalker's lightsaber.
In other words, Kylo Ren tracked down the map to Luke's sadness planet somehow and is going after Luke and Rey. Witnesses say Kylo isn't wearing his mask and is dueling one-on-one with Rey next to a cliff. Luke, meanwhile, handily fights off all of the other Knights in this part of the spoiler-filled scene breakdown at Making Star Wars:
The first black knight has an axe and moves towards the Luke but is Force pushed away to his death after being thrown through the air.
'
After Luke dispatches the first Knight he ignites his green lightsaber.
Luke moves through each Knight one-by-one.
Rey and Kylo's battle moves up to the side of a cliff.
Suddenly Rey is nowhere to be seen. She's taken out of the battle; she's either wounded or appears to go over the side of the cliff.
Luke Skywalker casually walks towards Kylo to finish him but Kylo retreats when he sees his crew defeated.
Luke Skywalker is a badass Jedi and he'll destroy your squad.
Damn right Kylo runs, the little bitch.
Anyway, it appears that Rey emerges from the cliff-side fight okay (she is a great climber, after all).