The doll on Marcus's shoulder jerks violently when the sand-creature is struck, though, as though feeling the impacts itself.
Darude does not seem to react to the darts, standing still on the far side of the corridor. The darts have punctured large holes in his sandy flesh, but his movements are as relentless as ever. After a moment, Marcus commands him to move to stand between him and the dart-shooters, and he shambles over.
Should provide a +4 cover bonus to AC if that trap goes off again, heh.