Swordsman Special Attacks

So I'm playing a swordsman specializing in axes. I'm using UO Steam and have binds set up for primary and secondary special attacks. When I use the keybind, it will show it once when I switch to it, and any time I use it after that it won't say anything unless I switch to the other special.

When I use them (i.e. Bleed, Mortal Strike) it doesn't really seem to do anything. Or maybe it is and I just can't tell? It will also randomly say I've delivered a concussive blow (almost like a trigger on normal attacks) even if that isn't one of the abilities and I haven't tried to trigger any of them with a hotkey.

So how exactly do these work? Are they bugged/broken, or is it doing stuff and I just can't tell?

This server doesn't utilize the special attacks like others may. But UOSteam is a client for all the different servers so that feature is still in the UO Steam Client.