i had a bristle wome in my tank messing around with one of my anomenes had a hard time catching it but i dit.i found him wrapping himself around a snail. yanked it out with some plastic salad spoons and tossed him in the backyard to the birds he was about 13 in fully extended
How is he now?
It wasn't the worm's fault. The bristles on the worm are just to protect it and will stick to the attacker, in this case your puffer. Bristle worms are normally very harmless, they don't attack live stuff unless theya re really really sick and about to die.