I would think that you'd be fearing for your own life - complete horror taking precedence over the overhyped I'm-totally-gonna-kick-your-butts-now rage.
i meant that if you were in a situation where you couldnt run; fighting being the only option
and i want to be able to sprint in tesv. you run about 10% faster in heavy armor, 15% faster in light armor, 20% faster in a robe (with an extra chance of tripping, of course), and 30% if your in nothing but your strange cloth underwear. of course, there would be some negatives:
chance to trip and fall
fatigue diminishes faster
damage done to front side increased (damage to back side decreased by a little bit)
attracts attention (more than likely not good attention)
makes it very hard to sneak
EDIT for some horsing around (pathetic attemp at a pun):
how about getting knocked off your horse? if you get shot in the back of the head while riding or horse your more than likely going to hit your head on the horses neck (unless your riding backwards on your horse, but thats a whole 'nother story) and then bounce off it's back
alternatively, if your a novice at horse riding, chances are your not going to get that far before falling off or, well, getting bucked off (of course this would make horseback riding a skill, and some races would have the plus 5 to it (namely imperials and the khajiit (because the khajiit ride the khajiit race known as the battlecats; dont remember what the actualy name for them was called)