Ok my first post in a while, going to play the devils advocate here....
Q. The warp jump generator description says Warp Spiders may make an extra move ' instead of assaulting'. Does this mean that they can make their extra move during the Assault phase only if they are in a position where they could assault or can they do it anyway?
A. This move can be made in any Assault phase during which the Warp Spiders are not assaulting or fighting in an assault.
Ok, so in literal terms this means I can move Spiders in the enemy assault phase if not in combat because the words 'any Assault phase'...
just a FYI, I would never do it think it needs some clarification...just keep a eye out if someone trys to pull this on you