This is a mission to kill caragors with arrows. Cel starts the mission with no arrows. You see the problem.
As you can see on your minimap, there's some ammo very close by. Dodge the caragors (there's a bonus for making it through the level without getting hit), and leap to the second level of the nearest building.
Now that you've got the ammo- use it. You need to take down 5 beasts with arrows, and three with headshots. You'll probably want to be using headshots anyway, so that's no chore.
If things get tight- flee. There's no time limit on this one, so don't be afraid play it safe. Finish killing the caragor to complete the memory