Well there are some boffer LARPs that don't really bother with roleplaying either. They're very combat focused and don't bother with things like magic systems, hitpoints, and the like. Others do, and they run the gamut from low magic settings to people flinging spells at demons.Well as I said I don't LARP, but I have played D&D. I figured there would be alot more role playing and less combat in an actual LARP, but I took it that the movie took some creative liberty and left those parts out to be more appealing to a general audience.
Other than the the fights involving the King I didn't notice anything I would call unsafe in the fight scenes, and you kind of got the impressing that the king wasn't playing by the same rules... he didn't care about safety, he cared about winning.
As for the unsafe fighting part, the King was fighting like a dick. There's usually a zero touching rule in a lot of LARPs, and there's staff on hand who will boot somebody if they're fighting unsafe...but some LARPs (Like the one I'm in) will allow people to touch if they both agree on permission to grapple, and then you can really go all out.