So I sent my first expedition force to explore a cavern I found. I didn't have enough red shirts uniforms to go around for my squad, but that was ok. So my milita commander was the first one down into the cavern and the first one attacked by the giant olm. It went well considering none of my guys was trained in anything and my two crossbow men forgot to get ammo (or I didn't set it up right ot get wooden/bone ammo). at the beginning of the fight the olm latched onto, then ripped out my militia commander's right hand off, then happily dropped it on the ground. But my militia commander, well he is tough, and apparently doesn't bleed, as he was able to use his one good hand and strike a blow to the olm before he was knocked down. The rest of hte fight was spent by my crossbow men chasing the hurt olm around hitting it over the head with their crossbows until the militia commander was able to get up and finish it off with is axe again.
I was quiet surprised to find that A. a torn off hand doesn't bleed, and B. A torn off hand doesn't need medical care and C. A torn off hand is fine after a day or so (besides the one hand thing).
Also a few other things I noticed. When my one handed dwarf was unhappy he had several meeting with the current outpost leader and felt better afterwards (his statues said he felt better after crying one someone's shoulders), this maybe an old feature as I haven't played the older version a lot.
Not sure if the hand thing is a bug, as I wanted to see the healthcare in action. But the dwarf wasn't bleeding, nor in pain so after the shock went away everything seemed find.