Sorry should have made this more clear
Role-Playing is basically acting without a script. You create a character in your head (it could be you, someone you admire, or a make-believe personae) and then decide how you think they would act in this pseudo-medieval world.
Live Action Role-Playing (LARP) is doing this in "live action", or in real time.
So instead of telling someone what you are doing (as with most role-playing games) you just do it yourself. If you want to attack someone, throw magick at your foe or run away, the choice is up to you and so is how its done. Swing a sword or axe, make a grand magickal gesture or just wiggle you finger, the choice is yours.
You decide how your character thinks and acts, then do it.
Does this Help?