I would only maim.
Heimdall is heading off to retrieve a horn. Once this horn is sounded all fighting stops on the planet (no exception). This is impart due to two reasons:
1. It signales that each side should begin marching to Vigrid.
2. Weapons don't work, rather they cannot harm anyone on the planet (again no exception). Example: A lightsaber hits someone on the head and instead of cleaving the head the saber bounces off doing no damage. A balster bolt is absorb and so forth.
And for those who are wondering why not get the horn first, that is because there is a certain time in which it has to be sounded. Doing it before then does nothing.
"Dulce bellum inexpertis."
Official Forum Expert on Norse Mythology
As Odin says in the Hovamal:
"Praise no day 'til evening; no wife 'til on her pyre; no sword 'til tested;
no maid 'til bedded; no ice 'til crossed;
no ale 'til drunk."