What are the odds of a successful javelin strike from an elevated position before the wolves get out of Skrik's range?

I'm trying to figure out a suitable way for him to come into contact with others... any of the others.  Them finding a wolf with a broken off poisoned javelin in it might be a suitable incentive to go looking for the crafter... especially since it's a numbing agent that none of them know how to make/find.