So, while my miners were digging a passage for water-powering my magma cannon, a dwarven caravan and two ambusher squads came. They arrived safely while ambushers ran around trying to kill someone's pet cat, and I thought I'd try to test the trap on live goblins. Okay, entrance bridge down, but some idiot immigrant woodworker, already friends with everyone, runs out with no job. I try to draft him, but he doesn't give a damn and runs straight for ambushers and gets his head smashed into pieces by a macegob. Well, whatever, his stupidity called for it anyway. Goblins go for the entrance, the macegob steps on the weapon trap with an -iron maul- and two copper maces, but only ends up with a grey shoulder and brown fingers. I check if anyone's in the magma trap and get a nasty surprise: inside it are 5 unarmed idiots, two of which are my treasured legendary siege operators, and one of them is right next to the entrance. I draft them all and set the station far, far away, but they don't seem give a damn too. The macegob leaps at my legendary 4 toughness dwarf, tangles together with him and falls, then instakills him next turn. Then he steps on another weapon trap and ends up with half of the body mangled and a slashed-out throat.
I wonder if a tantrum spiral would follow? But first, I'd like to know why the hell they were idling in restricted magma-trap area.