A description of how it was used in spoiler font below...
It's some kind of collapsible baton. He showed it (collapsed) to the man in front of him (Corin's first pic) then activated it as he swept his arm back to strike (and take out) the man behind him.
Very smoothly done, actually... ol' Ben's had hand-to-hand combat training, methinks.
Hmm. missed that. I will watch more carefully next week. Thanks.
Hmmmm...I didn’t see all of that...