A couple of questions

1. Can you use normal movement before you cast mi go brain case (ie move to somewhere no one normally goes and cast it to send a a nasty monster to a safer place)

2. Let’s say u have 2 one handed weapons one is like an enchanted knife and one is a carbine rifle. You go to fight a monster that you may be able to beat with just the knife. Can you roll like You just have the knife and then if you don’t pass the combat check roll the extra dice for the rifle or do you have to commit your weapons that you are using before the check is even attempted?

1. No. The card reads: "exhaust and spend all of your movement points for the turn to swap places with another investigator or monster in Arkham. " "All" is different from "any remaining", so, you can't move and then use it

2. No, weapons are to be declared before rolling