Idun: Well it depends upon what type of weapon it is and how it's powered.
*Meanwhile Heimdall throws two more crystals each at the very corner of the door, both are vaporized.*
Heimdall: Well it obviously is has movement sensors.
"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."