Aaaargh.. "Deadly blood" issues... Not sure what just happened.
So, I've got a pretty mature fort going, and finally decided to breach the candy cane. I set up a long path that first went through a bunch of repeating spikes, then through an arena with a marksdwarf gallery (20 elites) above, and then finally a twisty 1-wide hallway to prevent line-of-sight (and more importantly line-of-breath) until any potential survivors popped out into the middle of a swarm of 20 axe lords. The actual breach was done remotely by cave-in, sparing my miner, and things went very well for the most part - the spikes got about 75% of them, the marksdwarves about 24%, and only one made it into the twisty hallway, but bled out before making it through to the melee squads. So my axe lords were maybe a bit miffed about being left out of the fun.
However, there were 2-3 clowns left that decided to hang out near the entrance to the spike area. They were pretty weak ones - made of snow, no special attacks of any sort, basically one-shottable - so I turned off the spikes and sent the axes in. Now, one of the clown castes (mongoose fiend) had "deadly blood", but I figured the axe lords are in full masterwork steel (high boots, greaves, mail, breastplate, gauntlets, helm, shield, axe) with enough clothing underneath to avoid bad thoughts (trousers, shirt, socks, gloves, cap), and they're not actually fighting the mongeese, so there's not any blood flying around - they should just be able to walk through the path and take out those wimpy clowns. Their boots would get a bit dirty, and they may get a bit more from bumping into the wall or something, but they don't have much exposed skin. Apparently there must be other ways to get the blood on them, because 15/20 just flat out dropped dead.
Any ideas on what other ways there are to get blood a dwarfs skin from the ground/wall? My best guess at the moment is, since it was a 1-wide hallway, when the dorfs start climbing over each other, the one that ends up on the ground might be at risk... Other ideas, which seem less likely, would be 1) puddles deep enough to leak into boots, 2) boots being modeled as just coverings (i.e. there's no sole to the boot) combined with leaky socks, 3) some sort of blood mist hanging around in the air, 4) blood not being only "deadly", but acidic or something...
Any other thoughts?