
Bearlock |
There was a thread about this not too long ago somewhere, the general consensus for a house rule was that any weapon that could trip (which can also be used to reposition) could be used in an attempt to "trip"/unseat the rider.
In RL I'm pretty sure that's what the hook on a halberd was for.
Possibly the same could be allowed with weapons that have the "brace" ability, so long as you specifically target the rider.