Bear Trap is an offense skill that is pretty impractical, due to pretty much anyone knowing bear traps are bad.
Every level, damage increases and cooldown decreases.
This traps your foe in place for quite a while, meaning a lot of bombs could land on the victim while stuck in place.
The only good use would be to bait people into it somehow, or to attempt to snipe people with it.
This is only really useful for improving your skill collection.