Ben's hand moves to his side where the lightsaber sits, the other handing the flashlight to the nearest person. "He is, was, me." They deserve an explanation and this is the best he can give them at the moment.

There's the feeling of a test in this. In facing your fears like his uncle once told them they would have to do in order to complete their training. With quick movements he unbuckles his lightsaber and flicks it on. A blue glow washing over everyone. "Don't take your eyes off him." That would only be to Kylo Ren's advantage.