But there is a very critical flaw in this skill...
Who can possibly resist killing critters? Isn't it a great feeling when you see a critter skittering about (especially spiders in BT... ugh), and then seeing a HUGE aimed shot crit 3 seconds later? It's a feeling similar to being a level 70 jerk in STV.
And to add to PLAYERS constantly picking on critters...
Go out to a forest area with either cats or wolves. Watch them for a while! They kill critters. I see cats go after deer all the time, and wolves go after rabbits and stuff.
On my rogue I just blind them and watch them wander aimlessly than run away for a while. Don't blind crabs in steam vaults though, they come attack you :P Actually do, its hilarious to see an angry critter.