O’Conner hears the distinct sound of carried weaponry, softly, off to his right, deep in the brush at the same moment that Starlet sees the men moving through the brush to the left side of the road. Clearly the pirates are using the negotiations and conversation to try and flank the group to either side.
(OOC: pretty much everyone is holding an action to react at this point, so the successful perception checks will let give O’Conner and Starlet first right to act against anyone on the path or the attackers they each noticed before all hell breaks loose.)