A #2 bridger, if it was a good catch, would actually be a little "high" up on a coon's arm or back leg if the coon had all of its weight commited to the pan when it fired the trap. This is, in my opinion, too big of a trap for a coon trap...but on the other hand a grip that high would have been a very solid catch nonetheless. I agree with the prior posts that this coon was just not far enough in this trap for a good catch to begin with.
Coons are strong, and they have rubbery, tapered feet. They can also swivel their back feet 45 degrees behind them, and they can grasp well with all four feet, too. Give them anything nearby to grab onto, and if the trap's hold isn't very good then its a good bet they will power out of it. If you weren't left with a toe, or partial foot, then it most likely just wasn't a very good hold to begin with.
Also, how long were the hairs in your trap? the fur on their feet is very short. higher up on the leg, the longer the fur length. Belly fur is much longer yet on coons. I'm wondering too if the trap didn't fire underneath the coon and grap some chest fur? how torn up was the set location, too. That is an indicator of how long you actually held that coon before it pulled out. Not much destruction, not much of a hold to begin with. Coons raise hell after a catch if they aren't on their way down a drowner...the evidence left after their struggle tells a lot about the crime scene, in my experience.
Jim-NE