Your skills can be at least partially nullified by the Njerps unknown DODGE skill. The only info you can reliably judge about an enemy is his armor if you view it before combat.
After the first one, every enemy next to you lowers YOUR skill by 10%. And, never let one get behind you. That's an automatic hit, just as it would be if you hit/shoot them from their rear.
The short bow is just about as bad as bows come. Only the juniper bow, and then crude bows, are worse. Don't count on it at long range.
I've had a character ripped to shreds by a Njerp using only a knife. I've hit Njerps with a half-dozen arrows and still, they advanced on me for melee. I have one-shot-killed many others. However, I'm never sanguine about facing any enemy, man, or beast. It's unpredictable, even after you've done all you can to improve your odds because so much about your enemy is unknown.