Some of the smugglers (and minions) are fleeing, not realizing that there are only two people to face, not an entire Preventer assault team.

All the better for Duo and River, because those at the front are starting to realize that no one else is rushing in.

Duo shoots a gun out of someone's hand. (And maybe a few fingers, too.) He wants these guys in too much pain to run away, but alive to answer lots of questions.