The runner has made it around the ambush site in the meantime and appears behind the leader now. It's the man the adventurers saw earlier that day, when he was tormented by the orcish guards.
Once he has the bandit leader's attention, he whispers something to him. The leader then turns back to the party.
“Looks like this is your lucky day today. My man here just informed me, that you saved his life today. I might be a bandit, or a thief, but I'm also a man of honor and won't let this go unnoticed.”
“You are free to go! Yes, that's right. Go, before I change my mind.”
The dwarf turns around and seems a little angered, he utters some hasty words, but then is put back into place by his superior. The trio then vanishes into the ruined building behind them, as does the runner.