ive just got skorms bow myself about 5 mins ago. what to do is..
1. go to the chapel of skorm
2. tele to oakvale and hire the merc there
3. recall to the chapel of skorm
4. tele to knothole glade and walk to the temple of avo
5. hire the merc there
6. recall to the chapel of skorm
7. tele to the guild and then walk to the picnic area
8. wait at the sundial until the shadow of the hand reaches just a few millimeters away from the zero (zero is midnight).
9. quickly recall to the chapel of skorm
10. as soon as the mercs take their pay and the money sign in the corner of the screen goes away, sacrifice one.
11. if you did not get the skorms bow then quickly sacrifice the other one.
12. if you did not get the skorms bow then reload a previous save and try again.
PS: your allignment must be very good for this to work