Alright, so I'm bumping this one last time, mostly because I never stop thinking of small, elegant things to add to combat.
First off, whatever key he maps bashing to, it doesn't really matter. Bind it to the Use key, give it a seperate key, I'm just going to remap it to the middle mouse button. Who has a two-button mouse nowadays anyways?
Next, How much effect should the bash have with regards to stunning, pushing, and damage? I think it makes sense that the sooner in the "bash" you make contact with your opponent the more it should push them, but the less it should hurt them or stun them. I also think that once you make contact with an object the animation should slow about 25 to 50%.
Finally, what other alternatives should their be for other weapon configurations? I've come up with ideas for what the shield-bash button should do if you have a spear (thrusting pole), polearm (swinging pole), two-hander, or one-hander without a shield.
For the spear and pole, the obvious choice is a cross-check, but I think they should be handled differently. For a spear, you lead more heavily with the top hand so that the spear point stays pointed out and you can get back into a thrusting position quickly. For a pole, you lead with the bottom hand so that you're in position to swing your weapon.
For the two-handed sword, the best idea I came up with was a bash with the cross-guard. The motion is a simple two-handed punch.
The one-handed sword without shield I figured would be fast enough for a pommel bash.
Using my MS-Paint Mastery
TM I created a quick illustration of each attack as seen from above. To avoid confusion (and too much work on my part) I left out the arms, so the fighter only has a head, shoulder pauldrons, and hands.
Another idea would be to allow either direction of cross-check for all poles and either method of bashing for all swords, with advantages and disadvantages for each, and have them controlled by mouse-movement/enemy-position like attacks. Now that I've thought of it, I like this idea best.
Lastly, I truly hope that the effect (damage, knock-down) of a bash is tied to the relative speed, strength, and weight of the two fighters. It would be funny if a peasant that tried to bash a charging Sargeant got knocked on his ass (or off his ass if he's mounted.
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