Aerda: You recognize the horseman's words as an attempt to rebuke undead... (The horseman, not the guardsmen of Heironeous, just to be clear who said it.) As Fendric has determined, these words are futile; yours, on the other hand, are quite successful, as the assailant slumps to the ground with a slithering exhale.
The man on horseback pulls back, tucks something from his right hand under his cloak (Spot DC 15, Know(Rel) DC 10 to recognize it), and puts his crossbow on his back, then dismounts and walks toward you slowly... The guardsman slows to a jog, as the cloaked man pulls back his hood, revealing a thinly-moustached, bald-headed face, plus a whole array of tiny earrings, and calls out: "There is no need, Brother of Heironeous. This was not one of ours."
Leaning down carefully, he pulls back the figure's hood, revealing a human face, red-headed, eyes closed, snoring peacefully. He then looks up:
"Are any of you hurt?"
(And XP!
Aerda: 750
Fendric/Nicollo/Merrim: 600
Victus/Draven: 500)