Two of the kenku are walking back and forth, while the third, which appears to be wearing some sort of shabby robe, is standing still near the southwest statue. They're at ease, and are calling across to each other, in various frightened voices. Each one is followed by sounds of coarse laughter from all three kenku. You catch a dwarven "Ye gods’ run! It's got a knife!" Then an elderly woman's voice, the same voice you heard earlier: "I think.. I think it wants our money – Charles, please, just, just give it our coins. Maybe... maybe it will let us go-SLASH-ooaAAHhhhhhhh!" Then a child: "Where's papa?" Then Lilya's voice: "How dare you? Let me out of here this minute! Hey!"

Spoiler: Positioning
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Currently you're still hidden at the edge of the trees. If you want to step out into the open, you should fairly easily be able to find a moment when none of the kenku are looking at you, but there's no way you can avoid being noticed by some of the crows.